On 27/08/2020 02:31, Grant Taylor wrote: > - SRS (mail-filter/libsrs2) [] > - emerge -a mail-filter/libsrs2 > I have been quietly following this discussion and I've seen SRS being mentioned a number of times.
Now, I know what SRS _does_ (perhaps not fully?) to prevent unintended rejection by a receiving MTA due to SPF policy and I know it's highly recommended if not mandatory for any sensible MTA set-up (allegedly). However, I'm less aware of the actual use cases where it is absolutely necessary to prevent above issues with SPF. Is SRS only relevant for MTAs that do any sort of forwarding/open relay? Oddly enough, I find some of the explanations I came across (including Wikipedia) fairly atrocious compared to SPF, DKIM, and DMARC which are perfectly explained and their use-cases are very clear. Though frankly, these three are fairly self explanatory themselves for anyone with technical background. I have been running my own MTA for just under a decade without SRS (but with the rest of the above) and never had issues with delivery - be that local or remote. However, I have explicitly disabled open relay and do not make use of any forwarding maps. It makes me wonder - am I missing something and have I just been lucky? - V
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