Mail Tester
mail-tester.com
mail-tester.com
It's frustrating that all my mail could have been triggering spam alerts for months without me knowing. I'm lucky someone kind reached out to tell me. It would be great to have a service automatically alert you if your messages look "spammy" (although I know real spammers would probably abuse it).
If you're willing to spend a little for some automation the Glock Apps is pretty good too.
dig srv1.mail-tester.com mx
;; ANSWER SECTION:
srv1.mail-tester.com. 562 IN MX 1 reception.mail-tester.com.
host reception.mail-tester.com
reception.mail-tester.com has address 94.23.206.89
whois 94.23.206.89
inetnum: 94.23.192.0 - 94.23.255.255
netname: OVH
descr: OVH SAS
descr: Dedicated Servers
descr: http://www.ovh.com
OVH is incredibly pro-spammer.I'd also say it's a bit weird to reduce OVH, which is arguably the largest European cloud provider, to just protecting spammers and scammers or being pro-spammer. But that's just my opinion based on my experiences, you may consider it to be different.
The company behind it is called WOOBEO, based in France, as listed in their TOS[3]. You can probably look up more information about them. Or you could contact them and ask them directly even[4].
All in all, if you think you have a good reason not to trust this site, or any site like it, it seems simple enough to just decide to not use it, like with any online service. I suppose this is just like any other risk/reward situation, and the reward seems to outweigh the risk for most people.
[1] https://www.mail-tester.com/faq#privacy [2] https://news.ycombinator.com/item?id=10408169 [3] https://www.mail-tester.com/manager/terms-of-service.html [4] https://www.mail-tester.com/contact