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by remram 1766 days ago
It breaks forwarding services that don't use SRS [1], for example OVH's. Like you mention, the next hop (example: gmail) will see it coming from the redirecting domain which is not valid per SRF rules. A SOFTFAIL will send a lot of emails to spam, a HARDFAIL means the email might be rejected outright.

[1]: https://en.wikipedia.org/wiki/Sender_Rewriting_Scheme

I need to move my domains off of OVH...