Hi. Courier rejects mail from domains that have MX records set up with plain IP addresses. This is a valid check according to the RFC and I know about that.
But I recently found out that the freaky "is my MX set up right" tool at MX Toolbox (and no other tool I know) complains about IP address in MX records. They state that this is completely ok. Not even a warning: http://mxtoolbox.com/SuperTool.aspx?action=mx%3aisoloc.com&run=toolpage That lead my to the question: WHY is it so bad to have IP addresses in MX? Is whatever reason still valid in 2014? I did not find any ressource describing a valid technical reason for this behaviour. Does anyone have a good and understandable reason why this is such a bad idea? It seems that today, most other major mail server software is happy with domains that courier rejects. I would appreciate if courier could be changed at least in this way: If there is a valid MX record (maybe besides any invalid) with equal or lower priority, courier should accept mail and route messages to the valid MX and ignore the invalid. It should not matter if there is also any bad record. My current example is mail from the Domain "isoloc.com": isoloc.com. 600 IN MX 10 217.160.79.52. isoloc.com. 600 IN MX 10 smtp.isoloc.com. Our Courier server refuses receiving and sending mail with this domain completely. As there has been not any problem with other recipients for a long time, People complain about us for not acceptng their mail. - Bernd
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