jeff,

> i am using amavis to forward to an internal relay.
> $forward_method = 'smtp:10.10.10.1'
> I have recently setup 2 new smtp relays running SSL only port 465
>
> i have setup round robin DNS names
>
> can i use a this config ?
>   $forward_method = 'smtp:smtp.example.com:465'
> or do I have to use an IP address ?

You can use a host name, but MX is not taken into account.

It is up to a DNS resolver to determine what happens
if a DNS name has multiple A records.

amavisd.conf-sample :

# POSTFIX, or SENDMAIL in dual-MTA setup, or EXIM V4
# (set host and port number as required; host can be specified
# as an IP address or a DNS name (A or CNAME, but MX is ignored)
#$forward_method = 'smtp:[127.0.0.1]:10025';  # where to forward checked mail
#$notify_method = $forward_method;            # where to submit notifications

> yes that did the trick

> $forward_method = 'smtp:example.com:2525';
>
> 2525      inet  n       -       n       -       -       smtpd
>           -o mynetworks=10.135.1.6
>           -o smtpd_client_restrictions=permit_mynetworks,reject
>           -o smtpd_enforce_tls=no
>           -o smtpd_sasl_auth_enable=no

If for some reason TLS is needed for passing a message from amavisd
back to MTA, amavisd-new-2.6.0 can do it with a quite good transfer
rate (transfer rate drops by about a factor of 2):
  $tls_security_level_out = 'may';

It can also accept mail over TLS, but this is much slower
(transfer speed drops by a factor of 10), so it is not something
to be recommended unless really necessary:
  $tls_security_level_in  = 'may';

Mark


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