Hello to the board !
We are sending our outgoing mails via a smarthost, which is configured at "E-MailProtection/SMTP/Advanced/Smarthost Settings"
We rarely do, but sometimes "bulkmail" (about 150 Mails) have to be sent the same time.
This needs a pretty long time.
First I thougt, the reason had to do with performance but looking closer at the issue, I found out, the smarthost rejects mails, in case they come in a huge amount
In the Mail Log I find:
"SMTP error from remote mail server after initial connection: host oursmarthost.de [XXX.XXX.XXX.XXX]: 421 4.7.0 oursmarthost.de Error: too many connections from IP xxx.xxx.xxx.xxx"
To my understanding our smarthost provider has limited the number of mails, that can be sent per time.
Due to error 421 ist refuses to proceed the email for a while.
In result it takes very long, to sent a larger number of mails.
Do I have the option to throttle the number of outgoing connections to the smarthost ?
I hope, this might speed up the delivery, as the smarthost won't get sore by getting bothered with too many emails at a time.
Best Regards
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