On Thu, Jul 23, 2015 at 06:26:57PM +0200, Sascha H?depohl wrote: > So my question is: Are there any reasonable reasons to have an invalid > helo hostname.
The sender is too cost/risk averse to make an effort to fix their broken system. Whether that's reasonable depends on context. > or should I relax my settings? Depends who's got the upper hand in the relationship. Do they need your business or do you need theirs? This is a political, not a technical problem. -- Viktor.