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The performance tuning properties mentioned before can be separately configured for each SMTP server.
cmsbs.mail.relay.a.threads = 5cmsbs.mail.relay.a.delay = 2000
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Details (in German): https://www.universal-messenger.de/knowledge-base/intern/01_faqs/multiple_mail_relays/index.html |
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You can define in each event file which relay to use for given event. |
Message rate limits and throttling
Please note that different SMTP servers might have different rate limits or might otherwise throttle mail delivery deliberately.
Microsoft Exchange
Microsoft Exchange has certain default rate limits that might be significant: https://docs.microsoft.com/en-us/exchange/mail-flow/message-rate-limits
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The default rate limit might be as low as 5 emails per minute. Whenever such a rate limit is breached, excess emails will be lost and not be sent again. |