On 2020-01-06 "Ralf G. R. Bergs" <ralf+deb...@bergs.biz> wrote: [...] > I have the following config snippet active to hamper spammers > brute-force trying local-parts on my server:
> ----------- 8x ------------- > smtp_ratelimit_hosts = * > smtp_ratelimit_rcpt = 4,0.25s,1.2,4m > ----------- 8x ------------- > I tried to send a message from Thunderbird to 10 recipients, but > instead of accepting the message an SMTP-level error occurred. Same > happened with macOS Mail client. > Apparently the implementation of Exim is faulty, because instead of > just delaying RCPT verbs it seems to close the connection. [...] > After the 5th occurence of an RCPT verb (for address > "ral...@example.org" in this case) the server seems to close the > connection: > ----------- 8x ------------- > 33 0.338365 2a00:6020:1eea:3420:0123:4567:89ab:cdef > 2a01:4f8:fff:fff::2 SMTP 131 C: RCPT TO:<ral...@example.org> > 34 0.397162 2a01:4f8:fff:fff::2 > 2a00:6020:1eea:3420:0123:4567:89ab:cdef TCP 74 587 → 63730 > [ACK] Seq=4151 Ack=1287 Win=29952 Len=0 > 35 0.602293 2a01:4f8:fff:fff::2 > 2a00:6020:1eea:3420:0123:4567:89ab:cdef SMTP 117 S: 250 Accepted > 36 0.603927 2a00:6020:1eea:3420:0123:4567:89ab:cdef > 2a01:4f8:fff:fff::2 SMTP 131 C: RCPT TO:<ral...@example.org> > 37 0.617940 2a01:4f8:fff:fff::2 > 2a00:6020:1eea:3420:0123:4567:89ab:cdef SMTP 138 S: 421 > example.net lost input connection > ----------- 8x ------------- > When I removed the above config snippet I could properly send the > message with more than 5 recipients. > Unfortunately at the moment I have no means of trying a more recent > version of Exim -- I can only update to the latest oldstable version. > Many thanks in advance for looking into this. [...] Hello, I cannot reproduce this with 4.93, it just works as expected. cu Andreas