1 Topic by lug (edited by lug 2018-04-10 16:19:29)

  • lug
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Topic: DNSBL ignore authenticated users?

==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.8
- Linux/BSD distribution name and version: ubuntu 16.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mysql
- Web server (Apache or Nginx): nginx
- Manage mail accounts with iRedAdmin-Pro? yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====


hi,

one of our customers is on barracuda blacklist.
When he authenticates on out mailserver, iredmail blocks the connection because the ip is blacklisted at barracuda.
why is that when they authenticate via username/pass ?

----

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2 Reply by rrosson

  • rrosson
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Re: DNSBL ignore authenticated users?

lug wrote:

==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.8
- Linux/BSD distribution name and version: ubuntu 16.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): mysql
- Web server (Apache or Nginx): nginx
- Manage mail accounts with iRedAdmin-Pro? yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====


hi,

one of our customers is on barracuda blacklist.
When he authenticates on out mailserver, iredmail blocks the connection because the ip is blacklisted at barracuda.
why is that when they authenticate via username/pass ?

This sounds like the user has their client configured to use port 25. Port 25 should be reserved only for mail server to mail server communication. Have your user check their settings and ensure that they are using port 587 with authentication.

Hope this helps.
-Ron

3 Reply by lug

  • lug
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  • Posts: 147

Re: DNSBL ignore authenticated users?

So postscreen/dnsblog does not check on port 587? Only 25, right?

4 Reply by sayso

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Re: DNSBL ignore authenticated users?

postscreen runs on port 25. yes

5 Reply by ZhangHuangbin

  • ZhangHuangbin
  • ZhangHuangbin
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Re: DNSBL ignore authenticated users?

Hi @lug,

Please double check your user's MUA, make sure it uses port 587 with TLS (STARTTLS) secure connection, AND, SMTP authentication must be enabled.

6 Reply by lug

  • lug
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Re: DNSBL ignore authenticated users?

Yes they used Port 25, even if I said use 587 ... smile
Now everything should be fine, thx.