Kristijonas Lukas Bukauskas writes:
* - the domain I have with them for testing purposes.
Viktor Dukhovi and Sam Varshavchik have already provided their detailed
viewpoints which will help me a lot to continue working with the support of
this sending MTA.
My viewpoints are somewhat dated. The persona-non-grata status of MXs
pointing to CNAMEs – that verbiage appears to be new to the current SMTP
standard, I checked and did not find any equivalent language in the prior
one; so my implementation reflected that.
Be it as it may. I do not see any technical issues with MXs pointing to
CNAMEs, except that an additional lookup is required to resolve the CNAME in
most cases. If this is not within the scope of the current standard, then I
would not set up my domains like that.
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