Forum Discussion
Trying to find help for 550 5.7.511 Access denied, banned sender
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.
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?
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.
- Great, will read and see if I can do the same. Doesn't sendgrid have a mon thly subsc ription? it would cost us a lot to run through third party. will try to setup our own if I can. thanks for sharing.
Yes they would mostly have a fee. I dont know of free ones, or if they were any good. This is why its temporary for me, I dont want to keep paying the additional cost. The cost will depend on how many emails you send through it per month. Its not a big cost even up to 100,000, but as its a business service I provide, so my customers pay me, I have no choice than to pay to get it working until Microsoft find someone who knows what they are doing.
If the cost is high, an alternative is create another server just like your mail server, if the cost for that is much less than sendgrid etc. and send through that. I think you can send through any server an email account to send through (I think, I have not tried it but dont see why not). Although it gets a bit advanced then because smtp.com have done something with the return path in order to link the sending to the originating domain SPF record which is important to not get caught as spam.
