Problems using LMTP in PMG

[kienvt]

Hello
In the shipping of pmg there is an LMTP option, I don't see much mention of this in the documentation nor is it mentioned in the service firewall section. How to use LMTP properly to optimize sending and receiving of mail on mail server?

 

[dcsapak]

what do you mean exactly?

if your downstream server can receive mails via ltmp you can configure that in the transport to quote from the git log where the feature was implemeneted:

new feature lmtp support for simplifying setups
with lmtp capable downstream servers (e.g. dovecot)
Postfix support lmtp out of the box and can now deliver
mails directly to internal mailbox servers without
one more smtp connection

 

[kienvt]

what do you mean exactly?

if your downstream server can receive mails via ltmp you can configure that in the transport to quote from the git log where the feature was implemeneted:

I used the LMTP protocol to transport mail from PGM (version 6.2-3) to the mail server but it failed.
Transport with LMTP port 25

Jul 3 16:38:50 mailgw postfix/lmtp[15537]: B8AED851F1: to=<test2@evexx.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=1.1, delays=0.09/0/0.29/0.77, dsn=2.5.0, status=sent (250 2.5.0 OK (850F264A2972A0CD9D))
Jul 3 16:38:50 mailgw postfix/qmgr[2325]: B8AED851F1: removed
Jul 3 16:38:50 mailgw postfix/lmtp[15574]: C66B085174: to=<test2@evxx.com>, relay=x.x.x.20[x.x.x.20]:25, delay=0.09, delays=0/0.02/0.06/0, dsn=5.5.2, status=bounced (host x.x.x.20[x.x.x.20] refused to talk to me: 502 5.5.2 Error: command not recognized)
Jul 3 16:38:50 mailgw postfix/qmgr[2325]: C66B085174: removedl

Transport with SMTP port 25

Jul 3 16:49:22 mailgw postfix/lmtp[24302]: 3DEB9166136: to=<test2@evxx.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=6.2, delays=0.18/0/4.1/2, dsn=2.5.0, status=sent (250 2.5.0 OK (164A5E64A299A04D4E9))
Jul 3 16:49:22 mailgw postfix/qmgr[22775]: 3DEB9166136: removed
Jul 3 16:49:22 mailgw postfix/smtp[23053]: 3FB751661DB: to=<test2@evxx.com>, relay=x.x.x.20[x.x.x.20]:25, delay=0.43, delays=0/0/0.12/0.3, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 9D5A81FCCF530)
Jul 3 16:49:22 mailgw postfix/qmgr[22775]: 3FB751661DB: removed

 

[Stoiko Ivanov]

It seems that the server that listens on port 25 at IP x.x.x.20 does not speak LMTP...

 

[kienvt]

It seems that the server that listens on port 25 at IP x.x.x.20 does not speak LMTP...

Thank you, this is helpful feedback. I think the documentation needs more detailed information on this.

 

[Stoiko Ivanov]

Thank you, this is helpful feedback. I think the documentation needs more detailed information on this.

How would you phrase it? - glad to improve our documentation - but currently am not sure how to express that you need an LMTP capable downstream server if you want to use LMTP?