update domains.csv to add 3nt3.de

share/domains.csv

@@ -317,3 +317,4 @@ zaclys.net,mail.zaclys.net,993,mail.zaclys.net,465
 zju.edu.cn,imap.zju.edu.cn,993,smtp.zju.edu.cn,994
 zoho.com,imap.zoho.com,993,smtp.zoho.com,465
 zohomail.eu,imap.zoho.eu,993,smtp.zoho.eu,465
+3nt3.de,mail.3nt3.de,993,mail.3nt3.de,465