Tommy might be blocking SMTP requests

[msbsurfi]

Hello, 

I have been using my Azure students benefits currently and migrated some of my sites to Azure VM. Since azure do not allow mailing using its server IP, I was using heliohost for mailing purposes. Two of my sites that require mail services to run properly suddenly stopped sending mail (Though it was fine even after the migration). I checked the error log and found SMTP connection error. I have done the following checks already-

1. ufw not blocking SMTP ports
2. The Network firewall rules in Azure portal allows SMTP ports
3. Mail server domain is not proxied by cloudflare
4. Mail DNS records including spf are correct

Since these are not creating the problem, the most probable problem might be the IP blocklist by Tommy. Can you please check if 20.41.113.135 is blocked or not.

Domains:

1. dmcbonesbank.org (Username: msbsurfi)
2. hhfn.org.bd (Username: hhfn)

Regards,

MD Shifat Bin Siddique