Autodiscover not working

[fritex]

Greetings,

Thank you for asking.

I am sorry to hear you are experiencing an issue with receiving and/or sending e-mails while using Coudflare for your domain name.

@jill3

DNS records have autodiscover as a CNAME with Proxy link to

Is the CNAME proxied ?

Kindly, try switching e-mail related DNS records like A autoconfig, A autodiscover, A mail, A webmail to (DNS-only).
Make sure your MX record for your domain is pointed to an unproxied ( cloud) mail.domain.com.
Double-check your e-mail client MS Outlook and make sure you’re using mail.domain.com for POP3/IMAP/SMTP.

Usually, the MX record should point to a hostname such as mail , and the A (or CNAME ) type record for that hostname should be set to (DNS Only).

Furthermore, if you recently moved your domain to your Cloudflare account, I could try to troubleshoot at first sight without knowing anything other as it could be related to either:

1. Wrongly setup e-mail related DNS records at the DNS tab of Cloudflare dashboard for your domain name
2. Possibly missing some TXT /CNAME records (for SPF , DKIM, DMARC if so?)
3. You are using a hostname like yourdomain.com which is (proxied) rather than the unproxied (DNS-only) like mail.yourdomain.com (possible this one not existing or is instead of being ) at the DNS tab of Cloudflare dashboard, in your e-mail client for sending/receiving server (MS Outlook, Mozilla Thunderbird, etc.)

May I suggest checking below article if your e-mail records (usually the A mail and the MX record) are configured properly while you are using Cloudflare for your domain name:

• Email undeliverable when using Cloudflare

Deprecated - Email Troubleshooting

This tutorial is deprecated in favour of Troubleshooting email issues · Cloudflare DNS docs

Archive

This tutorial covers the steps you should take if, when you change your domain to point to Cloudflare, you no longer receive emails to your domain. If you follow this tutorial and still need further help, please let us know what you have tried and share your domain name and, if possible, a redacted screenshot of your DNS records in Cloudflare. <a href="https://youtu.be/hLKyUWQcu08">…

@jill3

Why do I get a 521 from Cloudflare

Regarding Cloudflare 521 error, may I suggest you to try looking into below articles to troubleshoot the issue:

• https://support.cloudflare.com/hc/en-us/articles/115003011431-Troubleshooting-Cloudflare-5XX-errors#521error

Community Tip - Fixing Error 521: Web server is down

Error Try the suggestions in this Community Tip to help you fix Error 521: Web server is down. Background A 521 error happens when we are unable to make a TCP connection to your origin server. Specifically, Cloudflare tried to connect to your origin server on port 80 or 443, but received a connection refused error. This is often caused by security or firewall software and happens if the origin server has directly refused Cloudflare’s proxy request. [Banner in tip catalog] Quick Fix Ideas …

Furthermore, before moving to Cloudflare, was your Website working over HTTPS connection?
May I ask what SSL option have you got selected under the SSL/TLS tab at Cloudflare dashboard for your domain ( Flexible, Full, Full Strict … )?

Here is a way to re-check if you correctly setup the SSL for your domain with Cloudflare:

Deprecated - Step 2: Setting up SSL with Cloudflare

This tutorial is deprecated in favour of Get started with SSL/TLS · Cloudflare SSL/TLS docs

Archive

This tutorial covers getting SSL working with Cloudflare in various different scenarios. This assumes you already have your website set up on Cloudflare with all your DNS records set to , if not - please visit <a href="https://community.cloudflare.com/t/64309">Step 1</a>. Do you want the website to use HTTPS? Yes Do you already have a valid SSL certificate installed…

In case you do not have an SSL certificate, you can use Cloudflare SSL, if so, kindly make sure you follow the instructions as follows on the below article to setup an SSL certificate using Cloudflare Origin CA Certificate:

• Origin CA certificates · Cloudflare SSL/TLS docs

Last but not least, kindly have a look here for more information regarding correct SSL settings at the SSL/TLS tab on Cloudflare dashboard:

Why you should choose Full Strict, and only Full Strict

Unencrypted & unverified connections Imagine you open Paypal and suddenly get that warning [image] Would you continue? Probably not. For decades leaders in IT security have advocated that people upgrade their sites from unencrypted HTTP to secure HTTPS. And for a reason, everything you send via an HTTP connection is sent in plain text and can be intercepted at any point between you and the server. Equally, you’d probably not proceed if you got such a warning, right? [image] That’s when th…

Furthermore, do not skip below step and kindly re-check if Cloudflare is allowed to connect to your origin host to as follows in the below article:

• https://support.cloudflare.com/hc/en-us/articles/201897700-Allowing-Cloudflare-IP-addresses

Nevertheless, Cloudflare IP addresses list can be found here:

• IP Ranges