Forwarded to devs Spamassassin ignores mails to mailboxes that contain an ampersand, e.g. d&[email protected]

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Spamassassin ignores mails to mailboxes that contain an ampersand, e.g. d&[email protected]

PRODUCT, VERSION, OPERATING SYSTEM, ARCHITECTURE

Alma 8.10
Plesk 18.0.65 #2

PROBLEM DESCRIPTION

A mailbox with an ampersand in its name (e.g. d&[email protected]) is ignored by Spamassassin.

STEPS TO REPRODUCE

1) Create a mailbox d&[email protected].
2) Turn on spam filtering.
3) Send a mail to that mailbox.
4) Check the log entries for the incoming mail.

ACTUAL RESULT

No treatment by Spamassassin:

Jan 13 08:23:59 <hostname> postfix/smtpd[3629549]: CA2F427C15DD: client=tmo-087-104.customers.somesender.tld[123.123.123.123], sasl_method=CRAM-MD5, sasl_username=[email protected]
Jan 13 08:23:59 <hostname> psa-pc-remote[4043873]: CA2F427C15DD: from=<[email protected]> to=<d&[email protected]>
Jan 13 08:24:00 <hostname> postfix/cleanup[3626832]: CA2F427C15DD: message-id=<[email protected]>
Jan 13 08:24:00 <hostname> psa-pc-remote[4043873]: CA2F427C15DD: py-limit-out: stderr: INFO:__main__:Setting 'X-PPP-Vhost' header to 'domain.tld'
Jan 13 08:24:00 <hostname> psa-pc-remote[4043873]: CA2F427C15DD: py-limit-out: stderr: PASS
Jan 13 08:24:00 <hostname> psa-pc-remote[4043873]: CA2F427C15DD: check-quota: stderr: SKIP
Jan 13 08:24:00 <hostname> psa-pc-remote[4043873]: CA2F427C15DD: spf: stderr: PASS
Jan 13 08:24:00 <hostname> postfix/qmgr[1127742]: CA2F427C15DD: from=<[email protected]>, size=647, nrcpt=1 (queue active)
Jan 13 08:24:00 <hostname> postfix-local[3629558]: CA2F427C15DD: from=<[email protected]>, to=<d&[email protected]>, dirname=/var/qmail/mailnames
Jan 13 08:24:00 <hostname> dk_check[3629559]: CA2F427C15DD: DKIM Feed: No signature
Jan 13 08:24:00 <hostname> postfix-local[3629558]: CA2F427C15DD: dk_check: stderr: PASS
Jan 13 08:24:00 <hostname> postfix-local[3629558]: CA2F427C15DD: dmarc: stderr: PASS
Jan 13 08:24:00 <hostname> postfix-local[3629558]: CA2F427C15DD: spam: stderr: PASS
Jan 13 08:24:00 <hostname> postfix-local[3629558]: CA2F427C15DD: send message: id=S3629558 from=<[email protected]> to=<d&[email protected]>
Jan 13 08:24:00 <hostname> postfix/pipe[3627257]: CA2F427C15DD: to=<d&[email protected]>, relay=plesk_virtual, delay=1.2, delays=0.51/0/0/0.68, dsn=2.0.0, status=sent (delivered via plesk_virtual service)
Jan 13 08:24:00 <hostname> postfix/qmgr[1127742]: CA2F427C15DD: removed

EXPECTED RESULT

Treated by Spamassassin:

Jan 13 08:23:59 <hostname> postfix/smtpd[3629549]: CA2F427C15DD: client=tmo-087-104.customers.somesender.tld[123.123.123.123], sasl_method=CRAM-MD5, sasl_username=[email protected]
Jan 13 08:23:59 <hostname> psa-pc-remote[4043873]: CA2F427C15DD: from=<[email protected]> to=<d&[email protected]>
Jan 13 08:24:00 <hostname> postfix/cleanup[3626832]: CA2F427C15DD: message-id=<[email protected]>
Jan 13 08:24:00 <hostname> psa-pc-remote[4043873]: CA2F427C15DD: py-limit-out: stderr: INFO:__main__:Setting 'X-PPP-Vhost' header to 'domain.tld'
Jan 13 08:24:00 <hostname> psa-pc-remote[4043873]: CA2F427C15DD: py-limit-out: stderr: PASS
Jan 13 08:24:00 <hostname> psa-pc-remote[4043873]: CA2F427C15DD: check-quota: stderr: SKIP
Jan 13 08:24:00 <hostname> psa-pc-remote[4043873]: CA2F427C15DD: spf: stderr: PASS
Jan 13 08:24:00 <hostname> postfix/qmgr[1127742]: CA2F427C15DD: from=<[email protected]>, size=647, nrcpt=1 (queue active)
Jan 13 08:24:00 <hostname> postfix-local[3629558]: CA2F427C15DD: from=<[email protected]>, to=<d&[email protected]>, dirname=/var/qmail/mailnames
Jan 13 08:24:00 <hostname> dk_check[3629559]: CA2F427C15DD: DKIM Feed: No signature
Jan 13 08:24:00 <hostname> postfix-local[3629558]: CA2F427C15DD: dk_check: stderr: PASS
Jan 13 08:24:00 <hostname> postfix-local[3629558]: CA2F427C15DD: dmarc: stderr: PASS
Jan 13 08:24:00 <hostname> spamd[3640296]: spamd: processing message <[email protected]> for d&[email protected]:30
Jan 13 08:24:00 <hostname> spamd[3640296]: spamd: clean message (-3.8/7.0) for d&[email protected]:30 in 0.4 seconds, 70920 bytes.
Jan 13 08:24:00 <hostname> spamd[3640296]: spamd: result: . -3 - BAYES_00,DKIMWL_WL_MED,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HTML_IMAGE_RATIO_02,HTML_MESSAGE,RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H2,RCVD_IN_VALIDITY_CERTIFIED_BLOCKED,RCVD_IN_VALIDITY_RPBL_BLOCKED,SPF_HELO_PASS,SPF_PASS,URIBL_BLOCKED scantime=0.4,size=70920,user=xxxxxxxxxx,uid=30,required_score=7.0,rhost=127.0.0.1,raddr=127.0.0.1,rport=48800,mid=<[email protected]>,bayes=0.000000,autolearn=ham autolearn_force=no
Jan 13 08:24:00 <hostname> postfix-local[3629558]: CA2F427C15DD: spam: stderr: PASS
Jan 13 08:24:00 <hostname> postfix-local[3629558]: CA2F427C15DD: send message: id=S3629558 from=<[email protected]> to=<d&[email protected]>
Jan 13 08:24:00 <hostname> postfix/pipe[3627257]: CA2F427C15DD: to=<d&[email protected]>, relay=plesk_virtual, delay=1.2, delays=0.51/0/0/0.68, dsn=2.0.0, status=sent (delivered via plesk_virtual service)
Jan 13 08:24:00 <hostname> postfix/qmgr[1127742]: CA2F427C15DD: removed

ANY ADDITIONAL INFORMATION

I first suspected that the mailbox might be stored in a transcribed name, but in /var/qmail/mailnames/recipientdomain.tld it can be found as
drwx------. 5 popuser popuser 4096 Apr 29 2022 'd&s'
Maybe Spamassassin cannot handle the name?

YOUR EXPECTATIONS FROM PLESK SERVICE TEAM

Help with sorting out

 

[Sebahat.hadzhi]

Thank you for the report. I forwarded it to our team for further review. I will keep you posted.

 

[Sebahat.hadzhi]

Our engineers were unable to reproduce the issue on a test environment. Could you please double-check if spam filtering is enabled for the mail account in question?