1 Topic by rezakiani

  • rezakiani
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  • Registered: 2021-09-03
  • Posts: 4

Topic: Sender IP must resolve (in reply to RCPT TO command)

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):     1.4.0
- Deployed with iRedMail Easy or the downloadable installer? yes
- Linux/BSD distribution name and version: ubuntu 18.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mysql
- Web server (Apache or Nginx): nginx
- Manage mail accounts with iRedAdmin-Pro? no yet
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

hi

I installed it and it works fine, but in some cases it returns this message when sending a message:

<zzzz@zzzzz.com>: host mail.RDSSHIPPING.COM[79.143.187.45] said: 501
    5.7.1 <yyyyy@yyyyy.com>... Sender IP must resolve (in reply to
    RCPT TO command)

Please guide me in solving this problem

----

Spider Email Archiver: On-Premises, lightweight email archiving software developed by iRedMail team. Supports Amazon S3 compatible storage and custom branding.

2 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
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  • Registered: 2009-05-06
  • Posts: 31,088

Re: Sender IP must resolve (in reply to RCPT TO command)

Please add PTR DNS record for your server IP address.

3 Reply by rezakiani

  • rezakiani
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  • Registered: 2021-09-03
  • Posts: 4

Re: Sender IP must resolve (in reply to RCPT TO command)

ZhangHuangbin wrote:

Please add PTR DNS record for your server IP address.

Do I have to do this config on my own server?

How do I do this?
Can you help me more?

4 Reply by ms2504

  • ms2504
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  • Registered: 2019-06-15
  • Posts: 70

Re: Sender IP must resolve (in reply to RCPT TO command)

https://docs.iredmail.org/setup.dns.htm … ptr-record