SMTP error 421 failed to add recipient

Hello, after new install

NAME=“Ubuntu”
VERSION=“20.04 LTS (Focal Fossa)”
ID=ubuntu
ID_LIKE=debian

  • HestiaCP

When I try to send Email I get Error:
SMTP Error (421): failed to add recipient „[email protected]“ (Unexpected failure, please try later).

/var/log/exim4/mainlog returns:
2022-01-17 19:51:53 Taint mismatch, string_vformat: lsearch_open 35

Any Ideas what could be wrong? If You need any other info to debug just ask :slight_smile: Thanks in advance.

Please post the /etc/exim4/exim.template.conf

I can’t find /etc/exim4/exim.template.conf
But there is /etc/exim4/exim4.template.conf

######################################################################
#                                                                    #
#          Exim configuration file for Hestia Control Panel          #
#                                                                    #
######################################################################

#SPAMASSASSIN = yes
#SPAM_SCORE = 50
#CLAMD = yes

smtp_banner = $smtp_active_hostname
smtp_active_hostname = ${lookup dnsdb{>: defer_never,ptr=$interface_address}{${listextract{1}{$value}}}{$primary_hostname}}
add_environment = <; PATH=/bin:/usr/bin
keep_environment =
disable_ipv6 = true

domainlist local_domains = dsearch;/etc/exim4/domains/
domainlist relay_to_domains = dsearch;/etc/exim4/domains/
hostlist relay_from_hosts = 127.0.0.1
hostlist whitelist = net-iplsearch;/etc/exim4/white-blocks.conf
hostlist spammers = net-iplsearch;/etc/exim4/spam-blocks.conf
no_local_from_check
untrusted_set_sender = *
acl_smtp_connect = acl_check_spammers
acl_smtp_mail = acl_check_mail
acl_smtp_rcpt = acl_check_rcpt
acl_smtp_data = acl_check_data
acl_smtp_mime = acl_check_mime

.ifdef SPAMASSASSIN
spamd_address = 127.0.0.1 783
.endif

.ifdef CLAMD
av_scanner = clamd: /var/run/clamav/clamd.ctl
.endif

log_selector = +tls_sni

tls_advertise_hosts = *

# We test that $tls_in_sni is a valid domain, by an arbitrary email address [email protected] .
# Then, we extract the domain with a function that would fail if the email address is invalid.
# If the certificate exists, we will use it, otherwise the default certificate in /etc/ssl will be used.
tls_certificate = \
        ${if and {\
                     { eq {${domain:[email protected]$tls_in_sni}} {$tls_in_sni}}\
                     { exists{/usr/local/hestia/ssl/mail/$tls_in_sni.crt} }\
                 }\
                 {/usr/local/hestia/ssl/mail/$tls_in_sni.crt}\
                 {/usr/local/hestia/ssl/certificate.crt}\
         }

tls_privatekey = \
        ${if and {\
                     { eq {${domain:[email protected]$tls_in_sni}} {$tls_in_sni}}\
                     { exists{/usr/local/hestia/ssl/mail/$tls_in_sni.key} }\
                 }\
                 {/usr/local/hestia/ssl/mail/$tls_in_sni.key}\
                 {/usr/local/hestia/ssl/certificate.key}\
         }

daemon_smtp_ports = 25 : 465 : 587
tls_on_connect_ports = 465
never_users = root
host_lookup = *
rfc1413_hosts = *
rfc1413_query_timeout = 0s
ignore_bounce_errors_after = 2d
timeout_frozen_after = 7d

DKIM_DOMAIN = ${lc:${domain:$h_from:}}
DKIM_FILE = /etc/exim4/domains/${lc:${domain:$h_from:}}/dkim.pem
DKIM_PRIVATE_KEY = ${if exists{DKIM_FILE}{DKIM_FILE}{0}}

OUTGOING_IP = /etc/exim4/domains/$sender_address_domain/ip

SMTP_RELAY_FILE = ${if exists{/etc/exim4/domains/${sender_address_domain}/smtp_relay.conf}{/etc/exim4/domains/$sender_address_domain/smtp_relay.conf}{/etc/exim4/smtp_relay.conf}}
SMTP_RELAY_HOST = ${lookup{host}lsearch{SMTP_RELAY_FILE}}
SMTP_RELAY_PORT = ${lookup{port}lsearch{SMTP_RELAY_FILE}}
SMTP_RELAY_USER = ${lookup{user}lsearch{SMTP_RELAY_FILE}}
SMTP_RELAY_PASS = ${lookup{pass}lsearch{SMTP_RELAY_FILE}}

######################################################################
#                       ACL CONFIGURATION                            #
#         Specifies access control lists for incoming SMTP mail      #
######################################################################

acl_not_smtp = acl_not_smtp

begin acl

# Limit per user for PHP scripts
acl_not_smtp:
  deny    message       = Website of user $authenticated_id is sending too many emails - rate overlimit = $sender_rate / $sender_rate_period
  ratelimit             = 200 / 1h / $authenticated_id

  warn    ratelimit     = 100 / 1h / strict / $authenticated_id
  log_message           = Sender rate [limitlog]: log / account / $authenticated_id / $sender_rate / $sender_rate_period

  accept

acl_check_spammers:
  accept  hosts         = +whitelist

  drop    message       = Your host in blacklist on this server.
          log_message   = Host in blacklist
          hosts         = +spammers

  accept


acl_check_mail:
  deny    condition     = ${if eq{$sender_helo_name}{}}
          message       = HELO required before MAIL

  drop    message       = Helo name contains an IP address (HELO was $sender_helo_name) and not is valid
          condition     = ${if match{$sender_helo_name}{\N((\d{1,3}[.-]\d{1,3}[.-]\d{1,3}[.-]\d{1,3})|([0-9a-f]{8})|([0-9A-F]{8}))\N}{yes}{no}}
          condition     = ${if match {${lookup dnsdb{>: defer_never,ptr=$sender_host_address}}\}{$sender_helo_name}{no}{yes}}
          delay         = 45s

  drop    condition     = ${if isip{$sender_helo_name}}
          message       = Access denied - Invalid HELO name (See RFC2821 4.1.3)

  drop    condition     = ${if eq{[$interface_address]}{$sender_helo_name}}
          message       = $interface_address is _my_ address

  accept


acl_check_rcpt:
  accept  hosts         = :

# Limit per email account for SMTP auhenticated users
  deny    message       = Email account $authenticated_id is sending too many emails - rate overlimit = $sender_rate / $sender_rate_period
  ratelimit             = 200 / 1h / $authenticated_id

  warn    ratelimit     = 100 / 1h / strict / $authenticated_id
  log_message           = Sender rate [limitlog]: log / email / $authenticated_id / $sender_rate / $sender_rate_period

  deny    message       = Restricted characters in address
          domains       = +local_domains
          local_parts   = ^[.] : ^.*[@%!/|]

  deny    message       = Restricted characters in address
          domains       = !+local_domains
          local_parts   = ^[./|] : ^.*[@%!] : ^.*/\\.\\./

  require verify        = sender

  accept  hosts         = +relay_from_hosts
          control       = submission

  accept  authenticated = *
          control       = submission/domain=

  deny    message       = Rejected because $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text
          hosts         = !+whitelist
          dnslists      = ${readfile {/etc/exim4/dnsbl.conf}{:}}

  require message       = relay not permitted
          domains       = +local_domains : +relay_to_domains

  deny    message       = smtp auth required
         sender_domains = +local_domains
         !authenticated = *

  require verify        = recipient

.ifdef CLAMD
  warn    set acl_m0    = no

  warn    condition     = ${if exists {/etc/exim4/domains/$domain/antivirus}{yes}{no}}
          set acl_m0    = yes
.endif

.ifdef SPAMASSASSIN
  warn    set acl_m1    = no

  warn    condition     = ${if exists {/etc/exim4/domains/$domain/antispam}{yes}{no}}
          set acl_m1    = yes
.endif

  accept


acl_check_data:
.ifdef CLAMD
  deny   message        = Message contains a virus ($malware_name) and has been rejected
         malware        = */defer_ok
         condition      = ${if eq{$acl_m0}{yes}{yes}{no}}
.endif

.ifdef SPAMASSASSIN
  warn   !authenticated = *
         hosts          = !+relay_from_hosts
         condition      = ${if < {$message_size}{1024K}}
         condition      = ${if eq{$acl_m1}{yes}{yes}{no}}
         spam           = debian-spamd:true/defer_ok
         add_header     = X-Spam-Score: $spam_score_int
         add_header     = X-Spam-Bar: $spam_bar
         add_header     = X-Spam-Report: $spam_report
         set acl_m2     = $spam_score_int

  warn   condition      = ${if !eq{$acl_m2}{} {yes}{no}}
         condition      = ${if >{$acl_m2}{SPAM_SCORE} {yes}{no}}
         add_header     = X-Spam-Status: Yes
         message        = SpamAssassin detected spam (from $sender_address to $recipients).
.endif

  accept


acl_check_mime:
  deny   message        = Blacklisted file extension detected
         condition      = ${if match {${lc:$mime_filename}}{\N(\.ace|\.ade|\.adp|\.app|\.arj|\.asp|\.aspx|\.asx|\.bas|\.bat|\.cab|\.cer|\.chm|\.cmd|\.cnt|\.com|\.cpl|\.crt|\.csh|\.der|\.diagcab|\.dll|\.efi|\.exe|\.fla|\.fon|\.fxp|\.gadget|\.grp|\.hlp|\.hpj|\.hta|\.htc|\.img|\.inf|\.ins|\.iso|\.isp|\.its|\.jar|\.jnlp|\.js|\.jse|\.ksh|\.lib|\.lnk|\.mad|\.maf|\.mag|\.mam|\.maq|\.mar|\.mas|\.mat|\.mau|\.mav|\.maw|\.mcf|\.mda|\.mdb|\.mde|\.mdt|\.mdw|\.mdz|\.msc|\.msh|\.msh1|\.msh1xml|\.msh2|\.msh2xml|\.mshxml|\.msi|\.msp|\.mst|\.msu|\.ops|\.osd|\.pcd|\.pif|\.pl|\.plg|\.prf|\.prg|\.printerexport|\.ps1|\.ps1xml|\.ps2|\.ps2xml|\.psc1|\.psc2|\.psd1|\.psdm1|\.pst|\.py|\.pyc|\.pyo|\.pyw|\.pyz|\.pyzw|\.reg|\.scf|\.scr|\.sct|\.sfx|\.shb|\.shs|\.swf|\.sys|\.theme|\.tmp|\.ttf|\.url|\.vb|\.vba|\.vbe|\.vbp|\.vbs|\.vhd|\.vhdx|\.vsmacros|\.vsw|\.vxd|\.webpnp|\.website|\.wim|\.ws|\.wsc|\.wsf|\.wsh|\.xbap|\.xll|\.xnk)$\N}{1}{0}}

  accept



######################################################################
#                   AUTHENTICATION CONFIGURATION                     #
######################################################################
begin authenticators

smtp_relay_login:
  driver = plaintext
  public_name = LOGIN
  hide client_send = : SMTP_RELAY_USER : SMTP_RELAY_PASS

dovecot_plain:
  driver = dovecot
  public_name = PLAIN
  server_socket = /var/run/dovecot/auth-client
  server_set_id = $auth1

dovecot_login:
  driver = dovecot
  public_name = LOGIN
  server_socket = /var/run/dovecot/auth-client
  server_set_id = $auth1



######################################################################
#                      ROUTERS CONFIGURATION                         #
#               Specifies how addresses are handled                  #
######################################################################
begin routers

send_via_smtp_relay:
  driver = manualroute
  address_data = SMTP_RELAY_HOST:SMTP_RELAY_PORT
  domains = !+local_domains
  require_files = SMTP_RELAY_FILE
  transport = smtp_relay_smtp
  route_list = * ${extract{1}{:}{$address_data}}::${extract{2}{:}{$address_data}}
  no_more
  no_verify

dnslookup:
  driver = dnslookup
  domains = !+local_domains
  transport = remote_smtp
  no_more

userforward:
  driver = redirect
  check_local_user
  file = $home/.forward
  require_files = ${local_part}:+${home}/.forward
  domains = +local_domains
  allow_filter
  no_verify
  no_expn
  check_ancestor
  file_transport = address_file
  pipe_transport = address_pipe
  reply_transport = address_reply

procmail:
  driver = accept
  check_local_user
  require_files = ${local_part}:+${home}/.procmailrc:/usr/bin/procmail
  transport = procmail
  no_verify

autoreplay:
  driver = accept
  require_files = /etc/exim4/domains/$domain/autoreply.${local_part}.msg
  condition = ${if exists{/etc/exim4/domains/$domain/autoreply.${local_part}.msg}{yes}{no}}
  retry_use_local_part
  transport = userautoreply
  unseen

aliases:
  driver = redirect
  headers_add = X-redirected: yes
  data = ${extract{1}{:}{${lookup{[email protected]$domain}lsearch{/etc/exim4/domains/$domain/aliases}}}}
  require_files = /etc/exim4/domains/$domain/aliases
  redirect_router = dnslookup
  pipe_transport = address_pipe
  unseen

localuser_fwd_only:
  driver = accept
  transport = devnull
  condition = ${if exists{/etc/exim4/domains/$domain/fwd_only}{${lookup{$local_part}lsearch{/etc/exim4/domains/$domain/fwd_only}{true}{false}}}}

localuser_spam:
  driver = accept
  transport = local_spam_delivery
  condition = ${if eq {${if match{$h_X-Spam-Status:}{\N^Yes\N}{yes}{no}}} {${lookup{$local_part}lsearch{/etc/exim4/domains/$domain/passwd}{yes}{no_such_user}}}}

localuser:
  driver = accept
  transport = local_delivery
  condition = ${lookup{$local_part}lsearch{/etc/exim4/domains/$domain/passwd}{true}{false}}

catchall:
  driver = redirect
  headers_add = X-redirected: yes
  require_files = /etc/exim4/domains/$domain/aliases
  data = ${extract{1}{:}{${lookup{*@$domain}lsearch{/etc/exim4/domains/$domain/aliases}}}}
  file_transport = local_delivery
  redirect_router = dnslookup

terminate_alias:
  driver = accept
  transport = devnull
  condition = ${lookup{[email protected]$domain}lsearch{/etc/exim4/domains/$domain/aliases}{true}{false}}



######################################################################
#                      TRANSPORTS CONFIGURATION                      #
######################################################################
begin transports

smtp_relay_smtp:
  driver = smtp
  hosts_require_auth = $host_address
  hosts_require_tls = $host_address

remote_smtp:
  driver = smtp
  helo_data = ${lookup dnsdb{>: defer_never,ptr=$sending_ip_address}{${listextract{1}{$value}}}{$primary_hostname}}
  dkim_domain = DKIM_DOMAIN
  dkim_selector = mail
  dkim_private_key = DKIM_PRIVATE_KEY
  dkim_canon = relaxed
  dkim_strict = 0
  interface = ${if exists{OUTGOING_IP}{${readfile{OUTGOING_IP}}}}

procmail:
  driver = pipe
  command = "/usr/bin/procmail -d $local_part"
  return_path_add
  delivery_date_add
  envelope_to_add
  user = $local_part
  initgroups
  return_output

local_delivery:
  driver = appendfile
  maildir_format
  maildir_use_size_file
  user = ${extract{2}{:}{${lookup{$local_part}lsearch{/etc/exim4/domains/$domain/passwd}}}}
  group = mail
  create_directory
  directory_mode = 770
  mode = 660
  use_lockfile = no
  delivery_date_add
  envelope_to_add
  return_path_add
  directory = "${extract{5}{:}{${lookup{$local_part}lsearch{/etc/exim4/domains/$domain/passwd}}}}/mail/$domain/$local_part"
  quota = ${extract{6}{:}{${lookup{$local_part}lsearch{/etc/exim4/domains/$domain/passwd}}}}M
  quota_warn_threshold = 75%

local_spam_delivery:
  driver = appendfile
  maildir_format
  maildir_use_size_file
  user = ${extract{2}{:}{${lookup{$local_part}lsearch{/etc/exim4/domains/$domain/passwd}}}}
  group = mail
  create_directory
  directory_mode = 770
  mode = 660
  use_lockfile = no
  delivery_date_add
  envelope_to_add
  return_path_add
  directory = "${extract{5}{:}{${lookup{$local_part}lsearch{/etc/exim4/domains/$domain/passwd}}}}/mail/$domain/$local_part/.Spam"
  quota = ${extract{6}{:}{${lookup{$local_part}lsearch{/etc/exim4/domains/$domain/passwd}}}}M
  quota_directory = "${extract{5}{:}{${lookup{$local_part}lsearch{/etc/exim4/domains/$domain/passwd}}}}/mail/$domain/$local_part"
  quota_warn_threshold = 75%

address_pipe:
  driver = pipe
  return_output

address_file:
  driver = appendfile
  delivery_date_add
  envelope_to_add
  return_path_add

address_reply:
  driver = autoreply

userautoreply:
  driver = autoreply
  file = /etc/exim4/domains/$domain/autoreply.${local_part}.msg
  from = "${local_part}@${domain}"
  headers = Content-Type: text/plain; charset=utf-8;\nContent-Transfer-Encoding: 8bit
  subject = "${if def:h_Subject: {Autoreply: \"${rfc2047:$h_Subject:}\"} {Autoreply Message}}"
  to = "${sender_address}"

devnull:
  driver = appendfile
  file = /dev/null



######################################################################
#                      RETRY CONFIGURATION                           #
######################################################################
begin retry

# Address or Domain    Error       Retries
# -----------------    -----       -------
*                      *           F,2h,15m; G,16h,1h,1.5; F,4d,6h



######################################################################
#                      REWRITE CONFIGURATION                         #
######################################################################
begin rewrite



######################################################################

What happens when you run exim4 -Bv

[email protected]:/etc/exim4# exim4 -Bv
Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,
not directly from a shell command line. Options and/or arguments control
what it does when called. For a list of options, see the Exim documentation.

There is one problem with receiving mail too.
If I send test mail from Gmail acc I wont receive it.
If I send mail from Contact form on same domain there is no problems.

That why I wanted to know what version it is

And

exim -bV should provide it

[email protected]:/usr/local/hestia/src# exim4 -bV

Exim version 4.94.2 #2 built 13-Jul-2021 16:04:57

I think it was wrong -Bv

[email protected]:/var/log/exim4# exim -bV
Exim version 4.93 #3 built 28-Apr-2021 13:19:17
Copyright (c) University of Cambridge, 1995 - 2018
(c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2018
Berkeley DB: Berkeley DB 5.3.28: (September  9, 2013)
Support for: crypteq iconv() IPv6 PAM Perl Expand_dlfunc GnuTLS move_frozen_messages Content_Scanning DANE DKIM DNSSEC Event I18N OCSP PRDR PROXY SOCKS TCP_Fast_Open
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmjz dbmnz dnsdb dsearch ldap ldapdn ldapm mysql nis nis0 passwd pgsql sqlite
Authenticators: cram_md5 cyrus_sasl dovecot plaintext spa tls
Routers: accept dnslookup ipliteral iplookup manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore/mbx autoreply lmtp pipe smtp
Malware: f-protd f-prot6d drweb fsecure sophie clamd avast sock cmdline
Fixed never_users: 0
Configure owner: 0:0
Size of off_t: 8
Configuration file search path is /etc/exim4/exim4.conf:/var/lib/exim4/config.autogenerated
Configuration file is /var/lib/exim4/config.autogenerated

/var/lib/exim4/config.autogenerated

What is on line 35?

It is an strange issue you are the first person who is reporting issues. Versions should be correct

Sorry for delay.

hostlist spammers = net-iplsearch;/etc/exim4/spam-blocks.conf
no_local_from_check
untrusted_set_sender = *
acl_smtp_connect = acl_check_spammers
acl_smtp_mail = acl_check_mail

Have no idea anymore…

Any documentation at hestiacp how to properly downgrade or upgrade?

Downgrades arent supported, for upgrades just trigger apt update && apt upgrade.

Eris version is higher then my- 4.93, how did you upgrade to that

This depends on your OS and the available version on the related repository. Hestia doesnt provide any exim packages.

I am using Debian 11 as test server.

For Ubuntu 20.04 the last version is

Exim version 4.93 #3 built 28-Apr-2021 13:19:17

For whom it may concern: I have found a solution to this bug and posted it here: Exim4 mail sending issue

In short: go to the /etc/exim4/domains/(your domain name) directory and remove/rename files named ip and fwd_only