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I receive incoming emails but cannot send out. They stay in the 'Out' box. In Mail Preferences it says 'Outgoing Mail Server (SMTP) - in the slot is 'concordmedia.org.uk I am using IMAP system.

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    I have a feeling it's because your ISP may have switched off TLS1.0 support. El Cap Mail cannot do TLS1.2, so you'll have to try find a mail client that does. I'd check with your ISP to be certain.
    – Tetsujin
    Oct 1 '20 at 15:11
  • Thanks Tetsujin, I will investigate that. Eric Oct 1 '20 at 16:54
  • Welcome to Ask Different. If you don’t get good answers, consider asking a very precise question by editing your body. Like “how can I find the support number of my mail vendor” or “is there a troubleshooting wizard” or “does mail log errors somewhere so I can find and correct this”. How to Ask and tour are excellent guides if you need more help in phrasing a question that attracts good answers.
    – bmike
    Oct 1 '20 at 18:06
  • @Tetsujin This is not true! Apple Mail (and Apple Transport Security in general) added TLS 1.2 in 10.9 Mavericks in 2013. Oct 2 '20 at 1:37
  • Google spits a whole slew of issues with El Cap & 1.2
    – Tetsujin
    Oct 2 '20 at 9:13
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Not a lot to go on, but here are the steps I follow:

Is there a guide from your organization that explains how to configure Apple Mail or even a configuration profile so you can enter the settings perfectly without having to enter them manually?

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It is very unusual for an email server's SMTP address to use the same address as its parent website. It is much more usual to use an address starting with smtp.

A DNS lookup for smtp.concordmedia.org.uk gives different result to concordmedia.org.uk, so I am confident that your issue is an incorrectly specified SMTP server. Try smtp.concordmedia.org.uk.

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If the problem is due to El Capitan having insufficient HTTPS support (likely outdated cipher suites), you can fix the problem by setting up a local proxy server and routing https traffic through that. https://forums.macrumors.com/threads/fixing-https-issues-on-old-versions-of-os-x.2281326/

This would be the first instance I'm aware of in which a server dropped support for all of El Capitan's cipher suites, but it's plausible, as it has happened on older versions of OS X.

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