Forum Discussion
AmityWeb2021
Dec 22, 2021Copper Contributor
Trying to find help for 550 5.7.511 Access denied, banned sender
I run a mail server for many business clients of mine. Microsoft have blocked our IP address, so we cant send to Office365 email addresses. I get a bounce back saying: host cr-studio.mail.protec...
AdvUserAdmin
Dec 30, 2021Copper Contributor
timbertens I have contacted Linode multiple times on this issue. To be honest, I am disappointed with their response. It seems there is nothing they can do.
I'm also not really getting anywhere with Microsoft so far. Hopefully this issue is now being escalated.
suportecw
Dec 30, 2021Copper Contributor
9 days and Microsoft doesn't answered us... The problem persist and we can't do anything to resolve it =/
- AdvUserAdminJan 01, 2022Copper Contributor
suportecw Microsoft have advised their servers currenly will not accept email from any Linode IP addresses....
- AmityWeb2021Jan 01, 2022Copper ContributorCould you explain this a bit more please? Where did you get this info? My other Linode servers send email ok (using a PHP mail script).
- AmityWeb2021Dec 30, 2021Copper ContributorI do have someone replying to me. They just have not been able to solve it. They have escalated it.
I have sent them a link to this thread and the other one above, so inform them others have the same issue originating about the same time.
In the meantime as I have my own mail server with Postfix, I have created a smtp.com account and configured postfix to send through that. My emails are now working as the smtp.com IP is not blocked by Microsoft. But I want this to be temporary, until my issue is fixed and reverted back.- bootahDec 30, 2021Copper Contributor
AmityWeb2021 How did you do that? perhaps that would be a solution until Microsoft wakes up from their deep slumber. Is there any documentation on how to setup a new smtp using a different IP?
I have had many responses from Microsoft saying they are escalating the issue, but nothing happens after that. very very disappointing.
Also I am sure that Linode IPs are all blocked because I have a server with Linode with no emails ever being sent from it for the past 2 years. I set up a totally new account and an unused brand new domain and tried to send to a Microsoft365 email account, it was blocked.
Linode should do something about this, as well as Microsoft. Otherwise I will have to just move to a different data center, perhaps DigitalOcean?
- AmityWeb2021Dec 30, 2021Copper Contributor
bootahit depends on your current mail server... as I run my own server I have full control over it. So I can modify postfix's config files. The smtp.com article how to do it is here https://kb.smtp.com/article/944-postfix. I used to use Sendgrid some time ago, and its the same principle. In fact, I guess any 3rd party SMPT service can be used. It results in Postfix sending ALL email on the server through another SMTP account. My users still connect to their email accounts on our server, so they dont need to change any settings, but then our server uses another SMTP account to send them. That account would then have a different IP and is not blocked.