Hi @stephdl,
There are lot of logs but I am posting a few of them,
May 26 16:17:11 nethserver postfix/smtpd[16566]: warning: hostname nethserver.domain.com does not resolve to address 82.44.136.78
May 26 16:17:11 nethserver postfix/smtpd[16566]: connect from unknown[82.44.136.78]
May 26 16:17:11 nethserver rspamd[31036]: <5af356>; proxy; proxy_accept_socket: accepted milter connection from /var/run/rspamd/worker-proxy port 0
May 26 16:17:11 nethserver postfix/smtpd[16566]: 7B193803E896: client=unknown[82.44.136.78], sasl_method=PLAIN, sasl_username=cams@domain.com
May 26 16:17:11 nethserver rspamd[31036]: <5af356>; milter; rspamd_milter_process_command: got connection from 82.44.136.78:33439
May 26 16:17:11 nethserver postfix/cleanup[13719]: 7B193803E896: message-id=<>
May 26 16:17:12 nethserver rspamd[31036]: <5af356>; proxy; rspamd_mime_part_get_cte: detected missing CTE for part as: 7bit
May 26 16:17:12 nethserver rspamd[31036]: <5af356>; proxy; rspamd_message_parse: loaded message; id: ; queue-id: <7B193803E896>; size: 427416; checksum: <73801dfae9481e1043c32a5b4356da2d>
May 26 16:17:12 nethserver rspamd[31036]: <5af356>; lua; settings.lua:324: apply static settings authenticated (id = 1937017268); authenticated matched
May 26 16:17:12 nethserver rspamd[31036]: <5af356>; proxy; rspamd_mime_text_part_utf8_convert: converted from ISO-8859-1 to UTF-8 inlen: 129, outlen: 129 (129 UTF16 chars)
May 26 16:17:12 nethserver rspamd[31036]: <5af356>; proxy; rspamd_mime_part_detect_language: detected part language: en
May 26 16:17:12 nethserver rspamd[31036]: <5af356>; proxy; rspamd_stat_classifiers_process: skip statistics as SPAM class is missing
May 26 16:17:12 nethserver rspamd[31036]: <5af356>; proxy; rspamd_task_write_log: id: , qid: <7B193803E896>, ip: 82.144.36.178, user: cams@domain.com, from: cams@domain.com, (default: F (no action): [1.50/20.00] [MISSING_DATE(1.00){},MV_CASE(0.50){},FROM_EQ_ENVFROM(0.00){},FROM_HAS_DN(0.00){},HAS_ATTACHMENT(0.00){},RCPT_COUNT_ONE(0.00){1;},RCVD_COUNT_ZERO(0.00){0;},TO_DN_NONE(0.00){},TO_EQ_FROM(0.00){},TO_MATCH_ENVRCPT_ALL(0.00){}]), len: 427416, time: 40.504ms, dns req: 0, digest: <73801dfae9481e1043c32a5b4356da2d>, rcpts: cams@domain.com, mime_rcpts: cams@domain.com, settings_id: authenticated
May 26 16:17:12 nethserver rspamd[31036]: <5af356>; proxy; rspamd_protocol_http_reply: regexp statistics: 0 pcre regexps scanned, 0 regexps matched, 0 regexps total, 0 regexps cached, 0B scanned using pcre, 0B scanned total
May 26 16:17:12 nethserver opendkim[18328]: 7B193803E896: DKIM-Signature field added (s=default, d=domain.com)
May 26 16:17:12 nethserver postfix/qmgr[30707]: 7B193803E896: from=cams@domain.com, size=427682, nrcpt=1 (queue active)
May 26 16:17:12 nethserver dovecot: lmtp(13334): Connect from local
May 26 16:17:12 nethserver postfix/smtpd[16566]: disconnect from unknown[82.44.136.78]
May 26 16:17:12 nethserver rspamd[31036]: ; proxy; proxy_milter_finish_handler: finished milter connection
May 26 16:17:12 nethserver dovecot: lmtp(cams@domain.com): save: box=cam_11, uid=46471, msgid=, from="cam_11"cams@domain.com, subject=Motion Detection for 192.168.11.11 at 26/05/2020 15:17:07, flags=()
May 26 16:17:12 nethserver dovecot: lmtp(cams@domain.com): qNQ3BegkzV4WNAAAP5xBBA: sieve: msgid=unspecified: stored mail into mailbox ‘cam_11’
May 26 16:17:12 nethserver dovecot: lmtp(13334): Disconnect from local: Successful quit
May 26 16:17:12 nethserver postfix/lmtp[16690]: 7B193803E896: to=cams@domain.com, relay=nethserver.domain.com[/var/run/dovecot/lmtp], delay=0.64, delays=0.59/0/0/0.04, dsn=2.0.0, status=sent (250 2.0.0 cams@domain.com qNQ3BegkzV4WNAAAP5xBBA Saved)
May 26 16:17:12 nethserver postfix/qmgr[30707]: 7B193803E896: removed