In Hestia CP version 1.98 SMTP Relay per domain isn't working

Community Support Mail
21

The smtp relay only accepts PLAIN and Exim is configured to use LOGIN.

Edit /etc/exim4/exim4.conf.template and replace this:

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

with this:

smtp_relay_login:  
  driver = plaintext  
  public_name = PLAIN  
  hide client_send = ^SMTP_RELAY_USER^SMTP_RELAY_PASS

Once modified, restart exim and try again.

systemctl restart exim4
22 
Received Email:

2026-08-04 22:43:30 1wrIEj-00000001ZyA-3xNX <= [email protected] H=(webmail.swift.telnet.net.bd) [127.0.0.1] P=esmtpa A=dovecot_login:[email protected] S=575 id=a53ac1bdef8e798e71919bcbeb9f8f60@swift.telnet.net.bd2026-08-04 22:43:30 1wrIEj-00000001ZyA-3xNX H=swift.telnet.net.bd [120.50.18.186] TLS error on connection (recv): The TLS connection was non-properly terminated.2026-08-04 22:43:30 1wrIEj-00000001ZyA-3xNX => [email protected] R=send_via_smtp_relay T=smtp_relay_smtp H=swift.telnet.net.bd [120.50.18.186] X=TLS1.3:ECDHE_SECP256R1__ECDSA_SECP256R1_SHA256__AES_256_GCM:256 CV=no A=smtp_relay_login C="250 OK ids=9fa1ee57902311f1ba18bc24118997d0"2026-08-04 22:43:30 1wrIEj-00000001ZyA-3xNX Completed

but i have to allow in passwd.client file for authentication details. My Question is now what is the use of SMTP_Relay in domain.
23

Sorry, I don’t know what you mean.

24 
As per your suggestion edit the authentication::

smtp_relay_login:  
  driver = plaintext  
  public_name = PLAIN  
  hide client_send = ^SMTP_RELAY_USER^SMTP_RELAY_PASS

But still same mail issue.

then apply below:

Then list all relay hosts with their credentials in /etc/exim4/passwd.client:


swift.telnet.net.bd:[email protected]:NoReply$ecure
smtp.gmail.com:[email protected]:your_app_password

Now mail sending works. 

So My Question is if i have checked SMTP_Relay

smtp_relay
smtp_relay969×426 15.1 KB



why i have to add password into the client.passwd file
25

Yes, you need to enable the smtp relay and add the user and password allowed to use the smtp relay.

26 
yes  i have done this. 

but mail not sending. 

 so i have to put authentication details into the /etc/exim4/passwd.client file manually. 

its working.  

So, What is the default process.
27

You don’t need to use Ctrl+e every time you write something, only for outputs.

Then I don’t know what conf you are using but it’s not the one used by Hestia, looks like you have modified more things in the Exim conf.

28

Dear brother

nope i have google it and took the chance. So far you are kind enough to solve the problem since beginning feeling blessed. Again THANKS A LOT.

Bro a request if possible share a guide line how to configure SMTP_Relay for specific domains.

29

When you set SMTP Relay for a specific domain via web panel, it launchs this command:

v-add-mail-domain-smtp-relay USER DOMAIN HOST [USERNAME] [PASSWORD] [PORT]

that fills this file with the information passed:

/etc/exim4/domains/DOMAIN/smtp_relay.conf

Then, inside /etc/exim4/exim4.conf.template, it is retrieved in these lines:

SMTP_RELAY_FILE = ${if exists{/etc/exim4/domains/${lookup{$sender_address_domain}dsearch{/etc/exim4/domains}}/smtp_relay.conf}{/etc/exim4/domains/${lookup{$sender_address_domain}dsearch{/etc/exim4/domains}}/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}}

and then, based in @sahsanu explanations, seems it is used in this authenticator:

smtp_relay_login:  
  driver = plaintext  
  public_name = PLAIN  
  hide client_send = ^SMTP_RELAY_USER^SMTP_RELAY_PASS

Review that I said above to know if you have everything to use correctly the SMTP Relay by domain. Maybe something is wrong when creating the smtp_relay.conf file, or your exim4.conf.template misses that SMTP_RELAY_ lines, or are different for any reason.

30

Thanks a lot.