D7- I am receiving an obscene amount of spam user sign ups - how can I fix this?
123216
Massive spam users and spam entries despite triple layer protection
150173
Limit account applicants with certain email addresses
32207
Way to list "Contact Us" email address on web site, yet reduce likelihood of spam?
6666
How to avoid spammy links affecting us before SERP rankings going down
88222
Why did I apparently get +97 for joining a site?
13820
Spambots causing server crashes. How do I block them?
97434
^@ spam in tty (but seems to be system-wide)
5327
Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?
30409
Prevent malicious bots from posting spam
76014
How does Stack Overflow handle spam?
144234
How can I reduce the number of spammers registering with my phpBB site?
34245
Handling harassing users?
69984
Is there any way to block spam in Google Drive?
73153
How to get rid of my spamming notification?
145713
Gmail is marking my emails as SPAM. However, ISnotSPAM marks it as not-spam
46208
The review system suggested something was probably spam, what should I do when I see this?
98119
Add optional box for spam flags letting you say why you think it's spam