Dear collegues, my administration writes one(!) email with more than 3000 receipients in the envelope. (Please, no discussion about the sense of this. Period.)
Receiving that mail takes about 2 two hours. Delivering that mail is done very quick, as usual. I started debugging this and I recognized that after every "RCPT TO" it took a sucessive increasing time until the "250 Accepted" was answered. At the beginning this was a 10th of a second. After 1000 recipients there was a delay of ~one second after the 2000th recipients this delay increased smoothly to 2 secends ofter each rcpt-to I threw away all my bells and whistles in the exim config, but no success. So I started "strace" to see whats happening: At the beginning I see 18:35:36.048265 read(7, "RCPT TO:<AAAA@BBBBB>\r\n", 8191) = 45 18:35:36.063187 alarm(0) = 300 18:35:36.063233 rt_sigaction(SIGALRM, {sa_handler=0x55bc6f392180, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f8eff4d9730}, NULL, 8) = 0 18:35:36.140936 socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 9 see the nearly zero difference between the RCPT line and the socket line After ~1000 recipients I have: 18:40:51.670874 read(7, "RCPT TO:<XXXXX@YYYYYY>\r\n", 8191) = 43 18:40:51.685450 alarm(0) = 300 18:40:51.685538 rt_sigaction(SIGALRM, {sa_handler=0x55bc6f392180, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f8eff4d9730}, NULL, 8) = 0 18:40:52.277971 socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 9 so half a second between the rcpt line and the socket line After ~2000 recipients: 19:06:28.229652 read(7, "RCPT TO:<ZZZZ@ZZZZ>\r\n", 8191) = 29 19:06:28.244041 alarm(0) = 300 19:06:28.244253 rt_sigaction(SIGALRM, {sa_handler=0x55bc6f392180, sa_mask=[], sa_flags=SA_RESTORER, sa_restorer=0x7f8eff4d9730}, NULL, 8) = 0 19:06:29.776217 socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 9 about 1.5 seconds between rcpt and the socket line There are no dropped lines between the RCPT line until the socket line in the strace output Any ideas what's happening here ? (testing was done with "swaks" talking directly to the exim) Regards, Olaf -- Karlsruher Institut für Technologie (KIT) Steinbuch Centre for Computing (SCC) Dipl.-Geophys. Olaf Hopp Zirkel 2 Gebäude 20.21, Raum 316 76131 Karlsruhe Telefon: +49 721 608-48009 E-Mail: olaf.h...@kit.edu Web: www.scc.kit.edu Sitz der Körperschaft: Kaiserstraße 12, 76131 Karlsruhe KIT - Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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Description: S/MIME Cryptographic Signature
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