XF 2.2 Stop spam emails from signing up

Enter this in the banned email field: *.*.*@* .

Adjust to suit based on the number of periods and specify a specific domain if needed, such as: *.*.*.*@gmail.com .
Would also block email addresses which use only one dot in name? Like john.smith@gmail.com??

Would also need additional lines for other special characters?

To the OP - you'll just be playing whack-a-mole.
 
These?

Would also block email addresses which use only one dot in name? Like john.smith@gmail.com??

Would also need additional lines for other special characters?

It won't prevent regular single period accounts from registering.

I don't really understand the special characters question.
The * acts as a wildcard so will capture anything between the periods.
 
I have found very little that can top the overall effectiveness of Ozzmodz/Snog anti-spam addons, and have recommended them when I'm approached about a spam problem. I've used some for a couple of years, and coincidently purchased their contact form anti-spam addon today for my business domain after getting hit by a persistent automated form spammer for the past month. :-)
 
Excuse my English. What I do more
Blocking with .htaccess
IP we can use a range of addresses or Pv4 or Pv6 address

deny from 34.0.0.0/8
deny from 18.196.78.38
deny from 2a0b:7280:0200:0000:0432:e8ff:fe00:0dbf

TLD which is the country code. Here in the example we will block, China and Russian

<IfModule mod_geoip.c>
GeoIPEnable On

SetEnvIf GEOIP_COUNTRY_CODE CN BlockCountry
SetEnvIf GEOIP_COUNTRY_CODE_V6 CN BlockCountry
SetEnvIf GEOIP_COUNTRY_CODE RU BlockCountry
SetEnvIf GEOIP_COUNTRY_CODE_V6 RU BlockCountry

SetEnvIf GEOIP_COUNTRY_CODE ru BlockCountry
SetEnvIf GEOIP_COUNTRY_CODE_V6 ru BlockCountry

Allow from all
Deny from env=BlockCountry
</IfModule>

Blocking search engines (spam and hacking) with Robots.txt

User-agent: clouding
Disallow: /
User-agent: clouding.host
Disallow: /
User-agent: sdns2
Disallow: /

Attention, it may be necessary to put lowercase and uppercase. Some use both
It is better to search for a range of addresses than a single IP, since it changes it with each intrusion attempt
34.35.10.127---> 34.0.0.0/8
 
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