Hi, On Wed, 9 Jul 2003, Ramprasad A Padmanabhan wrote:
> Is there an API available with which I can directly write to lmtp > instead of sending a mail > > I am presently using postfix and sending the mail, But I believe that > calling an smtp agent has its own overheads. > I am sending 10-15 messages to around 850 mailboxes every hour using > postfix and aliases. The problem is there are too many lmtp processes > and I get lmtp lock errors too often > Sorry I am going again off-topic (speaking about lmtp mainly here) and yes I have one question too about "invalid headers" which is not off-topic ;) Anyways: Did you know that you can limit lmtp-processes in postfix (concurrency etc) which makes mail to go slower .. without limits you could run into these problems? Anyways LMTP (Local Mail Transfer Protocol) specification is covered pretty much by RFC2033 (http://www.ietf.org/). If you are sending mass-mailings (like you said but didn't say it directly) and you want to skip postfix: PERL: install Net::LMTP (perl -MCPAN -e "install "Net::LMTP"" --- ripped from perldoc Net::LTMP --- #!/usr/local/bin/perl -w use Net::LMTP; my $lmtp = Net::LMTP->new('mailboxhost', 24); $lmtp->mail($ENV{USER}); $lmtp->to('postmaster'); $lmtp->data(); $lmtp->datasend("To: postmaster\n"); $lmtp->datasend("\n"); $lmtp->datasend("A simple test message\n"); $lmtp->dataend(); $lmtp->quit; --- /ripped --- Others, see rfc and make your own client for it. Remember if you are delivering via unix-socket auth is not neccessary but in inetd-socket you need it. LMTP is much smtp-a-like (atleast there is no EHLO/HELO (there is LHLO) so it should be not too hard to write your own lmtp-client. Maybe there is lmtp-injectors which you can use (I remember there was but I don't remember). Remember to use eval's and make it stable so you will not lose mails. I understand there is unneccessary alias-lookups when mail is delivered via postfix but you can always deliver directly into user. And remember to insert headers correctly. -- lmtp-transaction with Cyrus's lmtpd without AUTH -- 220 foo.bar LMTP Cyrus v2.1.11 ready LHLO foo.bar 250-foo.bar 250-8BITMIME 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-SIZE 250-AUTH EXTERNAL 250 IGNOREQUOTA MAIL FROM: <[EMAIL PROTECTED]> 501 5.5.4 Syntax error in parameters MAIL FROM:<[EMAIL PROTECTED]> 250 2.1.0 ok RCPT TO:<[EMAIL PROTECTED]> 250 2.1.5 ok DATA 354 go ahead Testing . 554 5.6.0 Message contains invalid header ^ Invalid headers, lets try again with one header: (Somebody who knows rfc better than I, tell me what rfc said about header parsing - is this "legal" to say invalid header here if no headers at all?!) DATA 503 5.5.1 No recipients MAIL FROM:<[EMAIL PROTECTED]> 250 2.1.0 ok RCPT TO:<[EMAIL PROTECTED]> 250 2.1.5 ok DATA 54 go ahead From: [EMAIL PROTECTED] Test . 250 2.1.5 Ok -------------------- Btw, Net::LMTP didn't have any AUTH-related methods. If you are not doing "direct-deliver" (mail is coming from outside).. don't write your own MTA .. there is plenty of those already ;) Maybe your overhead in the postfix is generated via 'deliver' wrappered processes (fork per e-mail) which sucks, set transport to lmtp instead of that pipe-wrapper if you are using it. I hope this helped. Cheers, ++Titus
