I noticed that my mobile tablets and phones witd dynamic ip are blocked by fail2ban. Propably, that I use "type app" android client with plain text in SMTP. But I would like to connect like that, I dont want to reconfigure alle devices at this moment.
What to do on iredmail to allow connections?

I realy tried to find, but I did not the logs. Only I found is:
Oct 21 11:14:35 mailX.com fail2ban.actions[19214]: NOTICE [postfix-iredmail] Ban 171.79.37.255
Oct 21 11:14:35 mailX.com fail2ban.actions[19214]: NOTICE [postfix-iredmail] Ban 175.100.5.240
Oct 21 11:14:35 mailX.com fail2ban.actions[19214]: NOTICE [postfix-iredmail] Ban 175.101.30.226
and many more checked service  fail2ban staus.

in jail.local I have:
[dovecot-iredmail]
enabled     = true
filter      = dovecot.iredmail
action      = iptables-multiport[name=dovecot, port="http,https,smtp,submission,pop3,pop3s,imap,imaps,sieve", protocol=tcp]
logpath     = /var/log/dovecot.log
                /var/log/dovecot-imap.log
                /var/log/dovecot-pop3.log
                /var/log/dovecot-sieve.log

[postfix-iredmail]
enabled     = true
filter      = postfix.iredmail
action      = iptables-multiport[name=postfix, port="http,https,smtp,submission,pop3,pop3s,imap,imaps,sieve", protocol=tcp]
logpath     = /var/log/maillog

in those files above I can 't find nothing about fail2ban. Only suspicious entries are (in /var/log/maillog): in dovecot = user empty...

config of dovecot
[root@mail filter.d]# dovecot -n
# 2.2.27 (c0f36b0): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.4.16 (fed8554)
# OS: Linux 3.10.0-514.6.1.el7.x86_64 x86_64 CentOS Linux release 7.3.1611 (Core)
auth_master_user_separator = *
auth_mechanisms = PLAIN LOGIN
dict {
  acl = mysql:/etc/dovecot/dovecot-share-folder.conf
  quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf
}
disable_plaintext_auth = no

shows that ssl isn't required, by the way