How to configure postfix client on port 465?

Question

I installed postfix on a server, but port 25 was blocked by ISP. I followed http://www.postfix.org/TLS_README.html#client_smtps to configure smtps on port 465. I follow the configuration as Postfix ≥ 3.0: Sending only mail for a specific destination via SMTPS, But I have to add mail domain to /etc/postfix/transport.

a.com  relay-smtps:mx.a.com:465
b.com relay-smtps:mx.b.com:465

part of /etc/postfix/main.cf:

smtp_tls_session_cache_database = btree:/var/lib/postfix/smtp_scache
smtp_tls_security_level = may
tls_random_source = dev:/dev/urandom
smtp_tls_loglevel = 1
transport_maps = hash:/etc/postfix/transport

part of /etc/postfix/master.cf:

relay-smtps  unix  -       -       n       -       -       smtp
    # Client-side SMTPS requires "encrypt" or stronger.
    -o smtp_tls_security_level=encrypt
    -o smtp_tls_wrappermode=yes

For destination not in transport, postfix tries connect to port 25.

I can only send email to destination listed in transport.

How do I change the postfix so that it tries send all emails to [their own DNS MX record]:465 ? I have tried Postfix ≥ 3.0: Sending all remote mail to an SMTPS server:

relayhost = [mx.a.com]:465

But it was regarded as spam.

If I do like:

mydomain.com :
* relay-smtps:how can use DNS MX recode auto:465

How can I specify port 465 and use DNS MX record?

Thanks!

How to configure postfix client on port 465?

0 Answers0