Thanks. It's actually the mailing script this client is using that is adding the headers in this way. I will have to get with the client to resolve this.
That answers that issue. On Mon, Sep 18, 2023 at 9:53 AM Scott Mutter <mailopl...@amssupport.info> wrote: > We're seeing an increase of errors from Google's mail servers complaining > about multiple addresses in the From header. But these messages do not > have multiple addresses in the From headers or multiple From headers. > > Best I can tell, this seems to be caused by additional spaces in some of > the headers, I suppose the header immediately following the From header. > > I'm not really sure who is at fault here. Are leading spaces in mail > headers allowed? > > Headers formatted as: > > From: Name <em...@domain.tld> > MIME-Version: 1.0 > > Generates this multiple addresses in From header error. > > Headers formatted as: > > From: Name <em...@domain.tld> > MIME-Version: 1.0 > > Does not generate this error and messages are sent through. > > (In case the formatting of this message does not portray the issue > correctly, there is a single space before MIME-Version: 1.0 in the message > that generates this error) > > I'm not sure if a leading space in a message header is proper. But I > would also kind of lean towards this being a wrong regex being used by > Google's mail servers to detect multiple addresses in the From header. > > Anybody else seeing this or have any insights? > >
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