yes, i have this problem and this:
(connect to alt4.gmail-smtp-in.l.google.com[18.104.22.168]: Connection timed out)
I have also facing a similar problem while sending email to the recipient and received the following error while checking the log. What should i do next ?
Mar 3 22:47:02 mail postfix/smtp: 587CBC02212: to=<email@example.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.55, delays=0.04/0/0/0.51, dsn=2.0.0, status=sent (250 2.0.0 from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as D04ACC02244)
Mar 3 22:47:07 mail postfix/smtp: D04ACC02244: to=<firstname.lastname@example.org>, relay=antispam.citrt.net[22.214.171.124]:25, delay=4.5, delays=0.03/0/4.1/0.31, dsn=4.7.1, status=deferred (host antispam.citrt.net[126.96.36.199] said: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [188.8.131.52] (in reply to RCPT TO command))
I have turning off the DNS checking but another error coming up while sending to the recipient.
Mar 4 00:38:19 mail postfix/error: 6CA41C027D6: to=<email@example.com>, relay=none, delay=1461, delays=1461/0.01/0/0.01, dsn=4.4.1, status=deferred (delivery temporarily suspended: connect to tatar.ru[184.108.40.206]:25: Connection timed out)
FYi, we're here managed to received the emails from the said domain but we could not send out to them . The problem only happen on these particular address. Is there any option to add on @xxx.xx into the MTA trusted network or else ?
Mar 4 09:14:53 mail postfix/smtp: 5F680C02773: to=<firstname.lastname@example.org>, relay=antispam.citrt.net[220.127.116.11]:25, delay=32596, delays=32593/0.01/2.6/0.3, dsn=4.7.1, status=deferred (host antispam.citrt.net[18.104.22.168] said: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [22.214.171.124] (in reply to RCPT TO command))