Message has lines too long for transport

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Hello @GabrielPL,

Keep the line IGNORE_SMTP_LINE_LENGTH_LIMIT=1 in exim4 conf and in that config file /etc/exim4/exim4.conf.template, find remote_smtp: section inside TRANSPORTS.

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

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

remote_smtp: <<--- this is the section we will modify
  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
  hosts_try_fastopen = !*.l.google.com
  interface = ${if exists{OUTGOING_IP}{${readfile{OUTGOING_IP}}}}

And add this to the remote_smtp: section:

  .ifdef IGNORE_SMTP_LINE_LENGTH_LIMIT
    message_linelength_limit = 1G
  .endif

So remote_smtp: section will look like this:

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
  hosts_try_fastopen = !*.l.google.com
  interface = ${if exists{OUTGOING_IP}{${readfile{OUTGOING_IP}}}}
  .ifdef IGNORE_SMTP_LINE_LENGTH_LIMIT
    message_linelength_limit = 1G
  .endif

Restart exim4 and try again.

systemctl restart exim4

Cheers,
sahsanu

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