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I am running a Zimbra mail server version 7.2.7 on a Linux CentOS server. My email address is xxx@azucarcolombia.com.

When I send email to yyy@prosalon.com.co, the email immediately bounces, and the bounce email says:

The mail system

<yyy@prosalon.com.co>: host mail.prosalon.com.co[174.37.44.242] said:
501 5.7.1 <xxx@azucarcolombia.com>... Sender IP must resolve (in reply
to RCPT TO command)

I have tried to change the zimbra smtp banner with the following command on the zimbra CLI, but the problem persists:

zmprov mcf zimbraMtaMyHostname correo.azucarcolombia.com

To be clear, this only happens when sending to some specific email addresses. Gmail, for example, works fine.

quelquecosa
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  • Ping to mail domain and let me know the status – Nullpointer Jan 19 '16 at 13:14
  • what do you mean? should I ping my mail domain (correo.azucarcolombia.com) from my terminal? If this is what you mean, the result of the operation is: 64 bytes from correo.azucarcolombia.com (181.48.150.131): icmp_seq=4 ttl=64 time=0.013 ms – quelquecosa Jan 26 '16 at 17:14
  • Have you use alias for mailid which is bounce? – Nullpointer Jan 26 '16 at 17:23
  • When I ping the mail server that is bouncing my emails (mail.prosalon.com.co), this is the result: PING mail.prosalon.com.co (174.37.44.242) 56(84) bytes of data. 64 bytes from merakserver.com (174.37.44.242): icmp_seq=1 ttl=118 time=119 ms – quelquecosa Jan 26 '16 at 17:28

2 Answers2

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Make sure the rDNS (PTR record) for the IP matches the SMTP banner. For example, if you telnet x.x.x.x 25 and the banner returns mail.domain.com, you'll need to set the PTR to match the banner (i.e. mail.domain.com). You then need to allow sufficient time (based on TTL and DNS cache) for the changes to propagate before re-trying to send the email.

Mugurel
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This is not about Zimbra, but about configuring the DNS correctly. You should setup the reverse DNS (PTR record) correctly.

Dave M
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Micha Kersloot
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