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Warning: mail() [function.mail]: Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() in
Warning: mail() [function.mail]: Failed to connect to mailserver at "smtp.foo.tld" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() in
If it's already set as localhost in the php.ini file then setting it to localhost with ini_set won't change anything. Hence the error continues to appear. You need to change it to one that works.
Who is your ISP? Your ISP should have an SMTP server set up for you to configure things like this for. It's the same setting you'd add to Outlook or Thunderbird.
Warning: mail() [function.mail]: SMTP server response: 550-(phpserver) [122.167.128.101]:2555 is currently not permitted to relay 550-through this server. Perhaps you have not logged into the pop/imap server 550-in the last 30 minutes or do not have SMTP Authentication turned on in your 550 email client.