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IMAP problem -- Failed to write to socket: not connected (code: -1)

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http://forums.cpanel.net – I'm having email problems with webmail and IMAP. When I try to send email with Horde, I get this: There was an error sending your message: Failed to set sender: user@domain.net [SMTP: Failed to write to socket: not connected (code: -1, response: )]. I have read elsewhere that this is due to SMTP being blocked in csf, but I followed the instructions to set those to allow SMTP traffic: Code: SMTP_BLOCK = "0" SMTP_ALLOWLOCAL = "1" There's also: Code: SMTP_PORTS = "25" SMTP_ALLOWUSER = "cpanel" SMTP_ALLOWGROUP = "mail,mailman" Anywa (HowTos)