Failover for SMTP #8607

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1. link2xt

   self-assigned this

   on Aug 19, 2026
2. link2xt

   added a parent issue on Aug 19, 2026

   • dissolve "primary" relay notion (configured_addr) #8572
3. r10s commented on Sep 15, 2026

   

   r10s

   on Sep 15, 2026

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   idea discussed internally yesterday (not saying, it should be exactly like that):

   • when a message needs to be sent, and there is no SMTP connection or we consider the SMTP connection too old, pick a random relay and try to SMTP connect to that
   • if that fails, try the next relay, and so on
   • connecting might be done kind of parallel, if first relay is not connected after one second try the next already
4. link2xt commented on Sep 16, 2026

   

   link2xt

   on Sep 16, 2026

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   when a message needs to be sent, and there is no SMTP connection or we consider the SMTP connection too old, pick a random relay and try to SMTP connect to that
   if that fails, try the next relay, and so on

   Implemented this in #8705.

   connecting might be done kind of parallel, if first relay is not connected after one second try the next already

   We have this parallelization for hostnames/ports of a single transport already, and below that level also for IP addresses, so parallelizing transports as well might be too much.

   👍React with 👍1Reacted by biørn
5. link2xt

   closed this as completedin #8705on Sep 18, 2026