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Hi.
Is there a known restriction in the amount of recipients that qmail can handle?
We use qmail to deploy mails to several thousand of mailing lists. Some of
those lists have 30000+ subscribers.
With some test, we discovered the following:
- sending a mail to 15400 recipients (each address has 32 characters) works
fine
- sending the same mail to 15800 recipients (each address has 32
characters) fails with these error messages of our client software:
"Can't send command to SMTP host", "socket write error (code=10053)"
- sending the same mail to10000 recipients (each address has 70 characters)
fails
When we send our test-mail to a different mail server (tested with
CommuniGatePro) to 100000 recipients, everything works fine.
It looks, like if there is a buffer overflow in qmail, caused by
"recipients * length of address". Is there a patch to extend this buffer?
Martin
