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I'm trying to host a postfix mail server.I have a box with a fixed IP and also a mx record and spf record that link my box IP to my dns record. I can telnet to alt4.gmail-smtp-in.l.google.com 25 but when I send a mail to [email protected], I still receive this error

mailq

-Queue ID-  --Size-- ----Arrival Time---- -Sender/Recipient-------
CB502D9735*     389 Tue Jul 18 01:28:17  [email protected]
                                         [email protected]

37A54D8C06      389 Tue Jul 18 00:26:34  [email protected]
(conversation with alt4.gmail-smtp-in.l.google.com[74.125.200.26] timed out while receiving the initial server greeting)
                                         [email protected]


BBC43D9557      389 Tue Jul 18 01:11:20  [email protected]
(conversation with alt4.gmail-smtp-in.l.google.com[74.125.200.26] timed out while receiving the initial server greeting)
                                         [email protected]

telnet alt4.gmail-smtp-in.l.google.com 25


Trying 74.125.200.27...
Connected to alt4.gmail-smtp-in.l.google.com.
Escape character is '^]'.
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  • Stack Overflow is for programming questions, not questions about using or configuring Unix and its utilities. Unix & Linux or Server Fault would be better places for questions like this.
    – Barmar
    Commented Jul 18, 2023 at 2:54
  • 1
    Notice that you're never receiving the greeting message from the SMTP server when you telnet.
    – Barmar
    Commented Jul 18, 2023 at 2:56

1 Answer 1

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SMTP tests using telnet - waiting for SMTP greeting message

How long have you waited for SMTP greeting message? [test using telnet]
Problems with reverse DNS may trigger DNS resolution timeouts (typically 75s).
Some spam bots detection procedures intentionally delay SMTP greeting message.

Wait at least 5 minutes for SMTP greeting message. Exact delay may provide a valuable hint.

Your configured timeout for waiting for SMTP greeting may be too short.

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