Re: 501 Syntax error: Empty email address.

[Rolando Guaracio]

Fist of all, this is the arquitecture. mta3: frontend MTA that relay incoming messages from Internet to my company. mta1: internal MTA that is owner of my domain (domain.com). This MTA recives incoming message from Internet through mta3 and send messages to Internet       through mta4 mta4: This MTA send messages to Internet. Let's say that is an incoming message from sen...@example.com to recei...@domain.com. The account recei...@domain.com is over quota and bounce the message. Here are the logs of the three MTA's. ----------------------------------------------------------------------- mta3 recives an incoming message from Internet and send it to mta1. Oct 29 08:20:48 mta3 postfix/smtpd[21167]: 21AB2C0AD4: client=mail.example.com[x.x.x.x] Oct 29 08:20:48 mta3 postfix/cleanup[21399]: 21AB2C0AD4: message-id=<1220089107.3611446117637574.JavaMail.root@mailhost> Oct 29 08:20:48 mta3 postfix/qmgr[630]: 21AB2C0AD4: from=<sen...@example.com>, size=1450, nrcpt=1 (queue active) Oct 29 08:20:48 mta3 postfix/smtp[21683]: 21AB2C0AD4: to=<recei...@domain.com>, relay=mta1.domain.com[10.20.152.148]:25, delay=0.57, delays=0.36/0/0/0.2, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 5FA5740201) Oct 29 08:20:48 mta3 postfix/qmgr[630]: 21AB2C0AD4: removed mta1 send the message to the mailbox and bounce it because the user account is over quota. Oct 29 08:20:48 mta1 postfix/smtpd[28718]: 5FA5740201: client=mta3.domain.com[10.20.152.84] Oct 29 08:20:48 mta1 postfix/cleanup[30289]: 5FA5740201: message-id=<1220089107.3611446117637574.JavaMail.root@mailhost> Oct 29 08:20:48 mta1 postfix/qmgr[31491]: 5FA5740201: from=<sen...@example.com>, size=1659, nrcpt=1 (queue active) Oct 29 08:20:53 mta1 postfix/lmtp[29801]: 5FA5740201: to=<recei...@domain.com>, relay=mailbox4.domain.com[10.20.152.160]:7025, delay=5.4, delays=0.2/0.37/0/4.8, dsn=5.2.2, status=bounced (host mailbox.domain.com[10.20.152.160] said: 552 5.2.2 Over quota (in reply to end of DATA command)) Oct 29 08:20:56 mta1 postfix/bounce[29669]: 5FA5740201: sender non-delivery notification: 9234540212 Oct 29 08:20:56 mta1 postfix/qmgr[31491]: 5FA5740201: removed mta1 generates a NDN a send it to mta4. Oct 29 08:20:56 mta1 postfix/cleanup[30161]: 9234540212: message-id=<20151029112056.9234540...@mta1.domain.com> Oct 29 08:20:56 mta1 postfix/qmgr[31491]: 9234540212: from=<>, size=7386, nrcpt=1 (queue active) Oct 29 08:20:56 mta1 postfix/smtp[28468]: 9234540212: to=<sen...@example.com>, relay=mta4.domain.com[10.20.152.149]:25, delay=0.05, delays=0.03/0/0/0.02, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 980A1A0A49) Oct 29 08:20:56 mta1 postfix/qmgr[31491]: 9234540212: removed mta4 relay the NDN to Internet but is bounced with the error "501 Syntax error: Empty email address" Oct 29 08:20:56 mta4 postfix/smtpd[19077]: 980A1A0A49: client=mta1[10.20.152.148] Oct 29 08:20:56 mta4 postfix/cleanup[19079]: 980A1A0A49: message-id=<20151029112056.9234540...@mta1.domain.com> Oct 29 08:20:56 mta4 postfix/qmgr[30576]: 980A1A0A49: from=<>, size=7585, nrcpt=1 (queue active) Oct 29 08:20:56 mta4 postfix/smtp[18973]: 980A1A0A49: to=<sen...@example.com>, relay=mx1.example.com[x.x.x.x]:25, delay=0.04, delays=0.02/0/0.01/0, dsn=5.0.0, status=bounced (host mx1.example.com[x.x.x.x] said: 501 Syntax error: Empty email address. (in reply to MAIL FROM command)) Oct 29 08:20:56 mta4 postfix/qmgr[30576]: 980A1A0A49: removed So, the sender never have a notification that his mail was bounced because the account is over quota. Can I resolve this with some configuration with the NDN messages? For example send it without null from. how can I do that? Thank you :) On 10/29/2015 12:05 AM, Viktor Dukhovni wrote: On Wed, Oct 28, 2015 at 05:33:12PM -0300, Rolando Guaracio wrote: The problem is that this message is bounced with the following line: said: 501 Syntax error: Empty email address. (in reply to MAIL FROM command)). The string "Empty email address" does not appear in the Postfix source code. What can I do? You can report the complete log entry that contains that message without removing any leading or trailing content. And also say which machine logged that message (the original client or the relay). In all probability the message was rejected by a misconfigured external system, so the only thing you can do is try to talk some sense into the operators of that system, or accept the fact that bounces back to said system will be undeliverable.