this post was submitted on 19 Jun 2023
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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.

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[โ€“] fsk@lemmy.world 3 points 1 year ago (6 children)

I solved this problem once. What you do is have a custom captcha that you code yourself. It can be as simple as "What is 2+3?" and have 10-20 questions that you rotate between. Most spammers will be too lazy to update their spambot.

[โ€“] kargarocP4@startrek.website 2 points 1 year ago (1 children)

Don't just include it as text though. Rather, present the question as text in a picture.

[โ€“] pohart@lemmyrs.org 1 points 1 year ago (1 children)

This is very effective but also blocks people who spend on screen readers

[โ€“] joyjoy@lemmy.world 2 points 1 year ago

The solution there is to provide a voice over of the captcha.

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