Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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Is there a server managing the secondary connection? If yes, does it do routing for you already?
If both links are connected to the same server, it is very easy, something along the lines of
The easiest thing to do is use your ISP's smtp as your smtp relay for outgoing mails. I'm sure your ISP would permit you to do this since you are their subscriber.
If you read carefully you will see that not my PC's IP has problems, it's my server who is blacklisted by hotmail and I host multiple domains there. I can't tell my clients to use another SMTP
I'm sure we are talking about your public IP that has been blacklisted and this IP might have been through your router/firewall or your mail server is directly connected to the internet. Which ever the case, it is your public IP that has been blacklisted.
What I mean for using your ISP's smtp server is you would tell your sendmail server to relay through your ISP's smtp and not your local clients. Your local clients would still relay through your sendmail server and nothing would be changed on their MUA's settings.
In postfix there is a parameter in main.cf called "relay_host" that is used for this purpose and in sendmail, you have to look for its equivalent.
I'm sure we are talking about your public IP that has been blacklisted and this IP might have been through your router/firewall or your mail server is directly connected to the internet. Which ever the case, it is your public IP that has been blacklisted.
imho : will not be wise to block IPs right now - since IPs can be change overtime. but domain name will remain, and harder to change (from black-listed point of view).
the solution is implementing SMTP security both inbound and outbound - lets say doing cleaning-service in both direction
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