So some spam signups just happened (all username12345678@gmail.com format e-mail) This caused bounced mail to increase, causing Mailgun to block our domain to prevent it getting blacklisted.
So:
- Mail temporarily doesn’t work
- I closed signups for now
- I will ban the spam accounts
- I will check how to prevent (maybe approval required again?)
Stay tuned.
Edit: so apparently there is a captcha option which I now enabled. Let’s see if this prevents spam. Registrations open again.
Edit2 : Hmm Mailgun isn’t that fast in unblocking the domain. Closing signups again because validation mails aren’t sent
Edit 3: I convinced Mailgun to lift the block. Signups open again.
fwiw - there’s always an arms race between spammers and people trying to not get spammed. It’s often better to use off-the-shelf captcha’s or something as there are people who are able to put a LOT MORE resources into it (like Google, who has billions of dollars on the line to prevent ad-fraud and identify bots)
I used a custom captcha for my personal WordPress blog. It eliminated all the spam. (Fun fact: The spammers know how to work around most anti-spam WordPress plugins. If you roll your own, they aren’t going to update their spambot for one blog.)
I also used a custom captcha at work. We couldn’t use 3rd party filters because it was marking our customers’ comments as spam! The custom captcha also eliminated all the spam.
There’s also a problem with using 3rd party spam services. You have to give them all your data. You also usually have to pay for it, which can be a problem when you’re working for people with a tiny budget.