-----Ursprüngliche Nachricht----- Von: Ralph Seichter via mailop <[email protected]>
* How and when would you decide that the recipient responding with 5xx was due to the message itself or due to a blacklisted IP address? That's not something that can be decided based on SMTP. You are right. I can not rely on any sub return-code or error-message as others also stated here. But sometimes the error messages are clear and also the intention of the recipients so one backs off. * Can you unilaterally decide if it was acceptable to withhold the non-delivery status from your customers? Of corse not. However there could be an opt-in for senders so they give the delivery completely in other hands. It's just a theoricaly question to see the pro/cons. And i now starting to see some of them. * Are your customers OK with not being informed about your problems due to blocked IP addresses, or do they feel misled regarding the quality of your services? Informing the customers of service disruption is important to stay transparent and something we do. However should it be primary happen by bouncing mails back that in most cases, are not clear to the sender or will be read at all? There are (also) other channels to bring it to customers attention. * Why not solve the underlying issue of having your addresses blocked? You know, as you are a mailop yourself, it happens from time to time. There is no silver bullet and for this rare cases, we are trying to deal with it in a more modern and better way. Just some examples, that we have seen the last years: - we change hostnames of our mailservers but other MX have outdated/old DNS-informations. I'm not talking about the TTL, sometimes anti-spam appliances cache DNS-informations for more than one week. Thats what we saw. - other MX detect portsans from neighbor-networks and decide to block the parent-network (/23 in our case) - other MX rely solely on geo-location of sending ip or have outdated informations as networks have changed owner > I dont want to bother my users with bounces and have them send mails > over and over again until problem is solved. As a hypothetical customer of yours, I'd insist on knowing about every failed e-mail, especially if it was due to problems on your end. If you cannot address the issue that gets your IP addresses blocked, I would choose a different service provider. A mistrusting individual might interpret your "don't want to bother" as "don't want to risk losing". Sure and by default, a regular bounce is and should always be the default behavior. But as stated earlier, it could be an opt-in option to have mail delivered without another sender interaction. If this is a real benefit for the user, it's reasonable to think about making it an option. -Ralph _______________________________________________ mailop mailing list [email protected] https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
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