Thanks to khensu for pointing us in the right direction! Thought I'd post more in detail for anyone still having this problem. And SHAW should absolutely be helping, it's as simple as providing the correct server details that you enter into your email client software/app. They don't have to support the software or tell you how to do it, but at the very least should inform their customers this is the likely problem and then provide the link to their help page. Some email clients do set-up automatically and you may have not seen the options, and some have copied info from previous installations when upgrading computer so you may have older settings in there that are no longer accepted. You need to get into the account and server settings within your email client so you can manually configure the settings. SHAW does have 3 main help pages with general info on the server settings but a lot is duplicated and there are some details missing, which I'll try to fill in. (I am by no means an expert, just did a lot of researching/reading). Most of the info is geared toward encryption/smtp since most people are probably using wifi or cellular network these days vs hardwired ethernet connection (ie. some desktops/laptops), and they don't really explain about the authentication or why you would choose one server over another.
- https://support.shaw.ca/t5/internet-articles/how-to-set-up-your-shaw-email/ta-p/6497
- https://support.shaw.ca/t5/internet-articles/about-pop-and-imap-email-server-settings/ta-p/6731#cont...
- https://support.shaw.ca/t5/internet-articles/how-to-use-shaw-internet-services-with-microsoft-produc...
Use SSL/TLS Security for wifi/cell networks so info is encrypted from any interference. Maybe not required if device is connected using ethernet cables to secure router, but still a good idea these days. There is a different port to use depending if you choose encryption or not. May be called Encryption Method (MS Outlook) or Security Protocol.
Use POP3 protocol if you want to download emails to 1 device only / may or may not choose to keep copies on server / sent emails will not be on server/webmail. INCOMING SERVER: pop.shaw.ca and PORT 110 with no encryption or PORT 995 with SSL/TLS Encryption.
Use IMAP/SMTP (IN/OUT) protocols if you want emails on more than 1 device / to be able to sync all emails on all devices with server / keep copies of everything on server. INCOMING SERVER: imap.shaw.ca and PORT 143 with no encryption or PORT 993 with SSL/TLS Encryption.
Whether using pop3 or imap, the same secure smtp server is now used for sending emails. OUTGOING SERVER: mail.shaw.ca and PORT 587 with STARTTLS Encryption ON (*note different type) and CHECK the Authentication Required option for outgoing emails (then select same settings as incoming). The outgoing server using old Port 25 is no longer supported and it seems that baked into the insecure port is a limit of 10 recipients for emails that aren't authenticated.
"SMTP connections on port 25 are only for insecure connections from inside the Shaw network. Any secure connections, whether SSL, TLS, or StartTLS, use port 587 and require password authentication."
"In an effort to help limit spam, many Internet service providers block all traffic to port 25 unless that traffic is directed at one of the service providers’ servers. What this means to you is that if you use an e-mail client (as opposed to webmail) such as Outlook or Thunderbird, and are travelling and/or connected to a different network than you’re used to, you might not be able to send e-mail."
Hope this helps others who find this page by googling the undelivered server error (as I did), or shaw email recipients limited to 10.
