lost connection after EHLO problem

[fferraro87]

Hi,
i've a problem receiving email from an address (non on my server) to an address (in my zimbra server)

I've this version of Zimbra installed : 8.6.0_GA_1200.NETWORK installed on CentOS release 6.6 (Final)

Ok, that's the problem :

on my zimbra.log i've this error :

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Nov 10 11:14:09 mail postfix/smtpd[22824]: connect from smtp-group-1.welcomeitalia.it[213.182.87.33]
Nov 10 11:14:09 mail postfix/smtpd[22824]: lost connection after EHLO from smtp-group-1.welcomeitalia.it[213.182.87.33]
Nov 10 11:14:09 mail postfix/smtpd[22824]: disconnect from smtp-group-1.welcomeitalia.it[213.182.87.33]

instead, on sender server, they've this log :

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Nov  9 09:40:05 smtp-2 postfix/qmgr[22293]: 868CA140C56: from=<voicemail@welcomeitalia.it>, size=190024, nrcpt=1 (queue active)
Nov  9 09:40:05 smtp-2 postfixgroup2/smtp[26882]: 868CA140C56: to=<franz@party.it>, relay=mx1.party.it[185.96.219.24]:25, delay=2.5, delays=2.3/0/0.14/0.01, dsn=5.7.1, status=bounced (host mx1.party.it[185.96.219.24] said: 554 5.7.1 Mail from this email address is not allowed and  has been blocked. (in reply to MAIL FROM command))

the strange thing is that if from this smtp-group-1.welcomeitalia.it[213.182.87.33] they send with another address, everything going fine.
So i've whitelisted voicemail@welcomeitalia.it, but nothing change, i've always this error.

so how can i check why i've this loss connection after EHLO command?

in order to make a more detailed scene, emails sent from this voicemail@welcomeitalia.it there are faxes.

how can i fix?

Thanks for your support

[fferraro87]

i see this article https://www.sysarchitects.com/solved-po ... ehlo-rhel7 but i don't think that's a problem of message size.

[fferraro87]

and that's my zimbraMTARestriction :

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[zimbra@mail ~]$ zmprov gcf zimbraMTARestriction
zimbraMtaRestriction: reject_invalid_helo_hostname
zimbraMtaRestriction: reject_non_fqdn_sender
zimbraMtaRestriction: check_client_access lmdb:/opt/zimbra/conf/postfix_rbl_override