Postie works well with GoDaddy hosting, but you are required to use GoDaddy mail servers (rather than something like Gmail).
Create a new email address through the Cpanel functions in GoDaddy. After the email is created go to the Configure button that showed multiple ways to auto configure the email for many other hosts. At the bottom of the page it shows Manual Setup. This is for Postie.
When you enter the MailServer in Postie be sure to use the full server name: a2plcpnlxxxx.prod.iad2.secureserver.net (The xxxx will vary depending on your account)
Postie works well with Gmail (and Google apps for business), however, there are a few things that can get in the way.
First make sure your hosting company allows access to external mail servers. GoDaddy notably does not allow this. If you are hosting with GoDaddy there is no way to use Gmail, you must use the GoDaddy email server.
Second make sure you have enabled POP3 (or IMAP) access to your Gmail account. Go to the Forwarding and POP/IMAP tab in your Gmail settings and click the Enable POP for all mail radio button. See also the Gmail help page.
Finally set you settings to:
Mail Protocol: POP3-SSL or IMAP-SSL
Port: 995 or 993
Mail Server: pop.gmail.com or imap.gmail.com
Userid: your full email address
Password: your password
Gmail will not work with POP3.
Occasionally Gmail will stop working and you can see a Postie error message that says something like “[ALERT] Please log in via your web browser”. This means you must log into the account Postie is trying to access via https://gmail.com where you will be asked to confirm a login from whereever your server is located.
While the wording on this page makes it sound dangerous what it really means is “allow traditional authentication” which uses very high levels of encryption.
Starting in early 2022 Google started sending out messages similar to this:
To help keep your account secure, from May 30, 2022, Google no longer supports the use of third-party apps or devices which ask you to sign in to your Google Account using only your username and password.
Some users have reported that using an “app password” works.
Under “Security”, activate the the “2-steps verification” on the Google account.
Once it’s activated, set “App passwords”, “Select App” to “Mail”, “Select device” to “Other (custom name)”, give it a name (Postie Password) and copy the password generated at the end of the “App passwords” process.
Use the generated password on Postie instead of the Google account password.
The second step is to ensure your web server is sending the correct MIME type for *.webp images (image/webp). A little Googling will explain how to check/add MIME types for your server. If you are using shared hosting contact your hoster to see if it is set up correctly.