1 (edited by diana.lohmus 2021-02-06 18:49:22)

Topic: smtp port :587 not working in outlook mobile apps

==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.3.2 MARIADB edition
- Deployed with iRedMail Easy or the downloadable installer? iRedMail Easy
- Linux/BSD distribution name and version: CentOS Linux release 7.9.2009 (Core)
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): Mysql
- Web server (Apache or Nginx): nginx/1.16.1
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
I can receive all e-mails but cant send. There is no specific error message - only e-mail goes to draft.
In maillog I can see: postfix/submission/smtpd[13726]: timeout after UNKNOWN

I tested IMAP account in different android and apple devices.  Cant sent any e-mail. All works in android phone outlook app, when I use exchange settings. But IMAP account works well only in computer app - Outlook 2016 and outlook 2019.

I just discovered that for some reason mobile phone IP is being banned. password and username are correct, I double checked.

2

Re: smtp port :587 not working in outlook mobile apps

Is the IP banned by Fail2ban while the issue happening?

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3 (edited by diana.lohmus 2021-02-09 20:34:50)

Re: smtp port :587 not working in outlook mobile apps

ZhangHuangbin wrote:

Is the IP banned by Fail2ban while the issue happening?

No, not immediately. IP will banned after 5 attempts send email out.

Maillog:
Feb  9 14:20:42 mail postfix/submission/smtpd[29834]: connect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:20:42 mail postfix/submission/smtpd[29835]: connect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:20:42 mail postfix/submission/smtpd[29835]: lost connection after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:20:42 mail postfix/submission/smtpd[29835]: disconnect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:20:42 mail postfix/submission/smtpd[29835]: connect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:23:54 mail postfix/anvil[8953]: statistics: max connection rate 8/60s for (submission:46.131.33.220) at Feb  9 14:20:42
Feb  9 14:23:54 mail postfix/anvil[8953]: statistics: max connection count 5 for (submission:46.131.33.220) at Feb  9 14:20:42
Feb  9 14:25:08 mail postfix/submission/smtpd[29854]: connect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:08 mail postfix/submission/smtpd[29854]: lost connection after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:08 mail postfix/submission/smtpd[29854]: disconnect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:42 mail postfix/submission/smtpd[25277]: timeout after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:42 mail postfix/submission/smtpd[25277]: disconnect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:42 mail postfix/submission/smtpd[29832]: timeout after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:42 mail postfix/submission/smtpd[29832]: disconnect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:42 mail postfix/submission/smtpd[29833]: timeout after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:42 mail postfix/submission/smtpd[29833]: disconnect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:42 mail postfix/submission/smtpd[29834]: timeout after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:42 mail postfix/submission/smtpd[29834]: disconnect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:42 mail postfix/submission/smtpd[29835]: timeout after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]
Feb  9 14:25:42 mail postfix/submission/smtpd[29835]: disconnect from 220-33-131-46.dyn.estpak.ee[46.131.33.220]

And Fail2ban log:
2021-0 2-09T14:19:29.763766mail.saare.ee postfix/submission/smtpd[24840]: lost connection after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]

2021-0 2-09T14:20:42.414592mail.saare.ee postfix/submission/smtpd[29834]: lost connection after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]

2021-0 2-09T14:20:42.507655mail.saare.ee postfix/submission/smtpd[29834]: lost connection after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]

2021-0 2-09T14:20:42.699971mail.saare.ee postfix/submission/smtpd[29835]: lost connection after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]

2021-0 2-09T14:25:08.920946mail.saare.ee postfix/submission/smtpd[29854]: lost connection after UNKNOWN from 220-33-131-46.dyn.estpak.ee[46.131.33.220]