Re:Maddy: Composable all-in-one mail server in Go
by thaumaturgy on Sunday November 22, 2020 @11:51AM
(#25178855)
I happen to be running a test with them this week to see what deliverability looks like on their end. So far only 79% of their messages have been accepted for delivery by remote service providers. These are non-spam, non-transactional, typical business correspondence messages.
In their activity feed right now, SendGrid traffic is being blocked by comcast, GoDaddy, iCloud, and a cornucopia of smaller services.
On the receiving end, I've had to deal with waves of spam from SendGrid for years, and it's especially difficult because they carry a mix of spam and legitimate traffic, so blocking them causes complaints and not blocking them also causes complaints.
In their activity feed right now, SendGrid traffic is being blocked by comcast, GoDaddy, iCloud, and a cornucopia of smaller services.
Here's one of SendGrid's outbound IPs, listed on multiple RBLs used by other services: https://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a167....
On the receiving end, I've had to deal with waves of spam from SendGrid for years, and it's especially difficult because they carry a mix of spam and legitimate traffic, so blocking them causes complaints and not blocking them also causes complaints.