Re: lists
Am 20.12.2023 um 16:11:05 Uhr schrieb Christoph Brinkhaus:
> I have heard that there is a countermeasure against spam run be big
> mail providers by rejecting the first contact by SMTP and accepting
> the next contact. Most spammers seem to try just once.
Do they reject with 5xx or 4xx?
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