Question

postfix can't forward email

Posted November 12, 2013 6.2k views
tail /var/log/mail.log Nov 12 05:25:28 localhost postfix/smtp[20314]: connect to aspmx.l.google.com[2a00:1450:4001:c02::1a]:25: Network is unreachable telnet aspmx.l.google.com 25 Trying 173.194.70.27... Connected to aspmx.l.google.com. Escape character is '^]'. 220 mx.google.com ESMTP a4si20693693eew.354 - gsmtp
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5 answers
pablo November 12, 2013
Has it worked before? Have you tried restarting your droplet? If you installed a firewall, did you open the necessary ports? Have you created an SPF record?

Also, I don't think Google allows unsecure connections (i.e. on Port 25). I think it requires TLS on the default port: 465. See How To Use Google's SMTP Server.
How To use an SPF Record to Prevent Spoofing & Improve E-mail Reliability
by Pablo Carranza
A carefully tailored SPF record will reduce the likelihood of your domain name getting fraudulently spoofed and keep your messages from getting flagged as spam before they reach your recipients.
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admin266755 November 12, 2013
triavi.com. 1800 IN TXT "v=spf1 ip4:37.139.30.113 -all"
telnet aspmx.l.google.com 25 works (it uses ipv4)
telnet to my host works as well.
I'm not trying to use it's smtp,-it's an email forward (via /etc/postfix/virtual)
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admin266755 November 12, 2013
OK, this one seems resolved - the issue was in IPv6,
Just set inet_protocols=ipv4 in /etc/postfx/main.cf, restart postfix.

Now emails are forwarded:
postfix/smtp[3819]: EFC4D1C11D5: to=, orig_to=, relay=aspmx.l.google.com[173.194.69.27]:25, delay=6.3, delays=0.3/0/5.2/0.73, dsn=2.0.
0, status=sent (250 2.0.0 OK 1384239619 cl1si1153461bkc.228 - gsmtp)

status sent, but not appear come to gmail, but this is another story :)
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pablo November 12, 2013
RE: your SPF record

Change the -all to ~all. You may also want to run through the SPF Wizard.
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topcoder July 10, 2016

I tried the SPF Wizard, but I’m still having a problem getting everything to pass on mailtester. I get too many spf lookups as the error.

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