AWS EC2 Dedicated IP blocked by Outlook

[rfg]

We have Cloudron as our email server hosted on AWS EC2, configured with an elastic IP (dedicated).

However, since 4 weeks ago our mail is being blocked by Microsoft servers, apparently our IP is part of a network segment detected as spammers.

I have registered the IP in some microsoft page without results.

What other actions would you recommend that I take?

I'm even considering migrate to another provider.

thanks in advance.

[JOduMonT]

@rfg Yes it is possible, it could be a neighborhood situation
you could try to understand from where your IP is blacklisted https://mxtoolbox.com/blacklists.aspx
than ask for a deban such as https://www.spamhaus.org/lookup/ for an example

but the best is to use a relay such as MailJet, SendGrid, MailGun, ...
you may want to read this to understand a little bit more what is your situation.

[girish]

@rfg You have to setup a mail relay for your outbound mails. The big cloud providers like aws, gce, azure will all block emails from VMs directly. See https://cloudron.io/documentation/email/#relay-outbound-mails