nothing related to receiving any email from Gmail but I found something odd. Only in gmail there is network is unreachable.
when sending email to gmail
05/16/2023, 06:35:44 PM info BE7BC16BF3E: to=<example@gmail.com>, relay=none, delay=77, delays=14/0.05/63/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:4023:c0b::1b]:25: Network is unreachable)
05/16/2023, 06:35:44 PM info connect to alt2.gmail-smtp-in.l.google.com[2607:f8b0:4023:c0b::1b]:25: Network is unreachable
05/16/2023, 06:35:43 PM info connect to alt1.gmail-smtp-in.l.google.com[2607:f8b0:400e:c00::1a]:25: Network is unreachable
05/16/2023, 06:35:42 PM info connect to alt1.gmail-smtp-in.l.google.com[173.194.202.27]:25: Connection timed out
05/16/2023, 06:35:12 PM info connect to gmail-smtp-in.l.google.com[64.233.170.26]:25: Connection timed out
05/16/2023, 06:34:42 PM info connect to gmail-smtp-in.l.google.com[2404:6800:4003:c1a::1a]:25: Network is unreachable
05/16/2023, 06:34:41 PM info disconnect from mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248] ehlo=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=6
05/16/2023, 06:34:41 PM info BE7BC16BF3E: from=<ns@example.com>, size=988, nrcpt=1 (queue active)
05/16/2023, 06:34:38 PM info BE7BC16BF3E: message-id=<3d-64635c00-13-68653980@15010945>
05/16/2023, 06:34:38 PM info BE7BC16BF3E: replace: header Received: from 4b5a6ea437ab (mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network [172.22.1.248])??(Authenticated sender: ns@example.com)??by mail.example.com (Postcow) with ESMTPA id from mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248]; from=<ns@example.com> to=<example@gmail.com> proto=ESMTP helo=<4b5a6ea437ab>: Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPA id BE7BC16BF3E??for <example@gmail.com>; Tue, 16 May 2023 16:04:26 +0530 (IST)
05/16/2023, 06:34:38 PM info BE7BC16BF3E: client=mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248], sasl_method=PLAIN, sasl_username=ns@example.com
when sending email to yahoo or others
05/16/2023, 06:32:20 PM info 731B816BF73: to=<example@yahoo.com>, relay=none, delay=156, delays=6/0.03/150/0, dsn=4.4.1, status=deferred (connect to mta6.am0.yahoodns.net[98.136.96.75]:25: Connection timed out)
05/16/2023, 06:32:20 PM info connect to mta6.am0.yahoodns.net[98.136.96.75]:25: Connection timed out
05/16/2023, 06:31:50 PM info connect to mta5.am0.yahoodns.net[98.136.96.75]:25: Connection timed out
05/16/2023, 06:31:20 PM info connect to mta7.am0.yahoodns.net[67.195.204.79]:25: Connection timed out
05/16/2023, 06:30:50 PM info connect to mta5.am0.yahoodns.net[98.136.96.76]:25: Connection timed out
05/16/2023, 06:30:20 PM info connect to mta7.am0.yahoodns.net[67.195.228.94]:25: Connection timed out
05/16/2023, 06:29:50 PM info disconnect from mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248] ehlo=1 auth=1 mail=1 rcpt=1 data=1 quit=1 commands=6
05/16/2023, 06:29:50 PM info 731B816BF73: from=<ns@example.com>, size=1011, nrcpt=1 (queue active)
05/16/2023, 06:29:45 PM info 731B816BF73: message-id=<3d-64635b00-f-68653980@15010879>
05/16/2023, 06:29:45 PM info 731B816BF73: replace: header Received: from 4b5a6ea437ab (mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network [172.22.1.248])??(Authenticated sender: ns@example.com)??by mail.example.com (Postcow) with ESMTPA id from mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248]; from=<ns@example.com> to=<example@yahoo.com> proto=ESMTP helo=<4b5a6ea437ab>: Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPA id 731B816BF73??for <example@yahoo.com>; Tue, 16 May 2023 15:59:44 +0530 (IST)
05/16/2023, 06:29:45 PM info 731B816BF73: client=mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248], sasl_method=PLAIN, sasl_username=ns@example.com
05/16/2023, 06:29:44 PM info connect from mailcowdockerized-sogo-mailcow-1.mailcowdockerized_mailcow-network[172.22.1.248]
as I have mentioned my outgoing port 25 is currently blocked by ISP that’s why there is connection timed out. I think so
Typically, after 24 hours of attempting to send an email, Gmail sends a notification regarding the delivery failure. However, I have not yet received such a notification as it has not been a full 24 hours. but I will paste that information also.