1 Topic by A.Kirill

  • A.Kirill
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Topic: The remote server checks for the existence of the mailbox

Need help!!!
We have the following situation. We write a regular letter to our clients and receive an error in response.
<a.shupljak@belaz.minsk.by>: host smtp1.belaz.minsk.by[178.124.155.100] said:
550 5.7.1 <a.shupljak@belaz.minsk.by>... Sender address verification failed
(in reply to RCPT TO command)

The remote server checks for the existence of the email address, but our server IRedMail does not allow verification.
How can I enable mailbox verification?

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2 Reply by Cthulhu

  • Cthulhu
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Re: The remote server checks for the existence of the mailbox

ptr:178.124.155.100 -> 100.155.124.178.in-addr.arpa

you are missing the PTR

https://docs.iredmail.org/setup.dns.html

3 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
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Re: The remote server checks for the existence of the mailbox

iRedMail disables the SMTP VRFY command by default in /etc/postfix/main.cf:

disable_vrfy_command = yes

You can set it to "no" to enable it.

WARNING: although this server can verify the address now, but it also means others can verify too, including hackers / crackers / spammers.

4 Reply by A.Kirill

  • A.Kirill
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Re: The remote server checks for the existence of the mailbox

ZhangHuangbin wrote:

iRedMail disables the SMTP VRFY command by default in /etc/postfix/main.cf:

disable_vrfy_command = yes

You can set it to "no" to enable it.

WARNING: although this server can verify the address now, but it also means others can verify too, including hackers / crackers / spammers.

Thank you very much for the explanation!