Feb 13, 2018 · #5.5.0 smtp;553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1) This means the server you are trying to send to is blocking mail sent from your server. You'll need to contact the recipient's administrator or send your message using a different mail server.

May 31, 2017 · Well, it could be firewall related network location awareness on the SMTP server may not know where it is due to the bad dns and is choosing the wrong firewall profile, assuming it's Windows server. If you can't telnet to it that would be my wager on what the issue is. May 06, 2004 · Re: Can't send emailOutlook can't connect to SMTP server by ohoude Dec 9, 2004 2:03AM PST My dns server tells me the name, address and also the alias i used of my smtp server I have a mail server with postfix and dovecot. The mail server is on a VPS. At the moment, I can send/receive mails from the server itself. It seems to work OK. However, I'd like to use my mail addresses from my laptop. I configured my account, set up the IMAP and SMTP. IMAP works, I can receive my mails on my laptop. But I can't send any mail. Same thing happened to me, and about the same timing. I've created app-specific passwords at least 4 times so far, trying to get it all back up and running. I did find that they work on the SMTP server if I try to send an email, but the IMAP connection to the incoming server hasn't connected for hours, now. A gmail issue, perhaps? Nov 01, 2014 · Rebooting doesn't help. Reinstalling Yosemite doesn't help. If I switch to an old Mavericks partition it works fine. The Connection Doctor says "Could not connect to this SMTP server" and all the Detail Window shows is "INITIATING CONNECTION Nov 01 17:46:30.270 host:mail.domain.com -- port:143 -- socket:0x0 -- thread:0x6080010689c0".

- BUT I can't connect from a remote mail client (office outlook or mail) => the client doesn't recognize mail.mylocaldomain.com as an SMTP server (can't connect to the server). But I can send email through the stmp server of my ISP on port 25. Authentication is activated on the client with the same setting as for imap accounts.

May 31, 2017 · Well, it could be firewall related network location awareness on the SMTP server may not know where it is due to the bad dns and is choosing the wrong firewall profile, assuming it's Windows server. If you can't telnet to it that would be my wager on what the issue is. May 06, 2004 · Re: Can't send emailOutlook can't connect to SMTP server by ohoude Dec 9, 2004 2:03AM PST My dns server tells me the name, address and also the alias i used of my smtp server

Sep 19, 2018 · what are the current pop/smtp att.yahoo.com incoming/outgoing server numbers? I use Outlook for e-mail. I am now unable to connect to the server for 2 days or so.

Jul 04, 2011 · Can't connect to SMTP server :(Discussion in 'Server Operation' started by apriloneil, Jul 4, 2011. apriloneil New Member. I can't connect to your server either: If you can connect to the port, it indicates some other Outlook configuration issue, even though it can still be a firewall/anti-virus software problem. Notes: Residential ISPs often block outgoing mail ports for outside mail servers (that don't belong to that provider), like ports 25, 465, 587.