On 09/03/2017 11:21 AM, sebb wrote: > On 3 September 2017 at 07:34, Daniel Gruno <[email protected]> wrote: >> On 09/02/2017 12:36 PM, sebb wrote: >>> On 2 September 2017 at 09:02, <[email protected]> wrote: >>>> Repository: incubator-ponymail >>>> Updated Branches: >>>> refs/heads/master c8f4d3b7d -> df0b7ee1c >>>> >>>> This deals with spurious whitespace that can exist on >>>> clustered setups due to corrections inside the MTAs. >>> >>> If MTAs can change trailing whitespace, will this affect the raw source? >>> >>> I think it's vital that the source agrees with the input. >>> That will not be the case if a cluster is set up so different MTAs >>> behave differently with the same input. >>> >> >> The raw source will be whatever is archived last. If the last copy to be >> archived has adjusted newline at the end, then that's what the mbox >> source will then have. If both have the redundant generator enabled, >> they will provide the same ID for the email (regardless of any >> whitespace added), which is what we first and foremost want here. >> >> Excess whitespace should really not cause duplicates here, there is no >> sense in doing so for anyones sake. > > But the question remains: why to the MTAs behave differently with > identical input? > > lists.a.o only has one subscription to each list, so can only receive > a single message. > At some point the message must be duplicated in order to feed all the > nodes in the cluster. > Either that duplication process is not preserving whitespace exactly, > or there are differences in the processing done by different members > of the cluster. > Neither seems right. > PonyMail should not need to allow for such external implementation issues >
In a perfect world, email should stay the same, but it doesn't. headers get added, and sometimes newlines for some reason. There's nothing special about the setup we use. it simply sends an email to multiple targets. The exact whys of the newline is not something I know about, nor know how to fix in MTAs, and I don't know how many MTAs do this. The easiest path is to simply tell Pony Mail in these cases to ignore trailing whitespace when computing an ID.
