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You guys are the experts, it seems. Just got in touch with the dealer. He seems to think the inverter is the most probably cause of the issue as well. He asked me to look for any error codes next time

I strongly doubt that error is relevant to that user. You are likely still misunderstanding that ACL, I already explained it previously. The user isn’t likely wanting to receive unauthenticated mail f

My bet would be that the error message is "Unauthenticated mail not allowed from this range" - which, of course, tells you next to nothing. You might then notice that the error is co

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Well I said for me: those who couldn't send the message got an error message. Which is great, but if they didn't have another way to contact me, they'd be stuck with a useless email address.

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