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-<td width="30%" align=right>$Date: 2001/05/30 00:04:47 $
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<H1 ALIGN=CENTER>Fetchmail Bugs and To-Do Items</H1>
personally chase obscure or marginal problems. Help with any of these
will be cheerfully accepted.<p>
+Errors in RCPT TO responses aren't handled gracefully. This shows up
+if you enable FEATURE(delay_checks, friend) in sendmail, so that you
+can accept mail to postmaster from sites otherwise blocked by my
+access database. The effect of this feature is that the MAIL FROM:
+address is always accepted OK, and any rejection of the sender is
+delayed until the RCPT TO: part of the SMTP transaction. This includes
+rejects such as 553 for invalid sender address. In this configuration
+fetchmail cannot deliver mail with invalid sender addresses, so you'll
+get lots of bounce messages when some spammers hit your mailbox (a
+pair of bounces every time fetchmail runs; one to FETCHMAIL-DAEMON
+generated by sendmail when fetchmail's bounce to the spammer is
+rejected, and one postmaster notify for that bounce). The problem is
+that fetchmail only recognises the 553 response in reply to MAIL FROM:
+and not RCPT TO:, see the unused code near sink.c:690. A really
+correct fix would callling a modified version of handle_smtp_error
+that doesn't RSET the connection.
+
Using LMTP alias with a local name that is not a full name fails horribly
(the LMTP port never gets stripped off the name).
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<P><ADDRESS>Eric S. Raymond <A HREF="mailto:esr@thyrsus.com"><esr@thyrsus.com></A></ADDRESS>