Blog

Feature announcement: a more granular status page

We're serious about transparency at Postmark, so a useful status page has always been really important to us. We hear feedback from you all the time that you love and appreciate the page, but that you wish it could be possible to see the status of individual services so that it's easier to tell the impact on sending/receiving.

Continue reading

How blacklists don’t work

Oh, how I love tossing an IP into multirbl.valli.org, a true one-stop-shop to instantly check “all the things.” But I also see a lot of people freak out when they see the results realizing, “My IP is blacklisted!!!”

At this point, I usually step away from my laptop, grab a cup of tea, listen to a clip of the ocean, and ask my sister to text me the story about a kid who knocked her glasses off in gym class resulting in a seemingly endless “Velma Moment.”

That’s because there’s just so many blacklists in existence, primarily because there are no requirements to start one. Anyone with a computer connected to the internet can create a public blacklist, and as a result, not all of them are useful or apply to the messages you send.

Continue reading

My file is not small, it’s fun-sized!

Your message file size matters. Some may think it’s great to send a ton of content in one fell swoop, but most ESPs limit the size of the message you can send through their service. That’s likely because they’re sending bulk messages, so they have to keep an eye on the processing power and time it takes to send a lot of very large messages at once.

Continue reading

Archive