Business Customer with own Mailserver. They ofter want to know, which of our
mailservers they can use as smarthost. We usualy tell them, that they operate
an own fully connected mailserver which does not need any smarthost to deliver
email to the world.
Some do not agree. The reasons the tell us are:
- It Tech XY has told them that sending via a smarthost is much more reliable.
- Their previous ISP asked them to use it's smarthost.
- Our Server has better 'reputation' than theirs and thus emails are less
likely to be considered spam by some spamfilters.
- Some seem to see DNS issues which I never could understand (they have
correct PTR and MX settings for their mailservers).
The problems I see with smarthosting are:
- If an email to a recipient does not make it there, we get the blame even on
trivias like 'user unknown'.
- We have to punch holes in the anti-spam thorttling measures to allow them to
send more emails / time than the usual private customer does.
- They can generate huge load peaks if they operate newsletters and similar.
- They often do relay bounce emails for strange reasons, or cause mail loops
which we do not want to be routed via our infrastructure.
- The risk that our infrastructure get's blacklisted because of trojan
activities on a customers infrastructure increases.
So how do other ISP handle such requests? Do customer with an own fully
connected mailserver have any reason to use their ISP's email infrastructure
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