If you have issues connecting with the Internet generally, you'll be unable to send or receive email. See Internet Connection Issues for troubleshooting tips.
See Computer Basics & Terminology for help with technical terms.
When changing email programs, you'll want to import the mail, contacts and settings from the old program to the new one.
Many programs will import this information from the most common current programs and even a few of the older ones.
However, many obsolete programs might need an intermediary program when moving to a more recent email client.
These programs match the format of the data from program you're exporting from and convert it to the one you're importing this information into.
You can use email backup software to both secure your important emails from loss as well as to restore it to another installation.
If you are an Outlook user, I neither run nor recommend Outlook so I cannot provide a decent level of support.
Winmail.dat issues may affect users of non-Microsoft email programs, but is invisible to Outlook.
Use only a currently-supported version of Outlook (automatic in Microsoft 365) or you won't get current patches for known vulnerabilities.
You need to uninstall obsolete software. Besides the security issues, there can be compatibility issues with Microsoft servers.
I've provided the following resources to help you learn more about using Outlook and dealing with its issues.
Without current backups of the Outlook.pst file, recovering your Outlook installation after a computer crash can be a nightmare.
You can also try repairing a corrupt file.
There is more about dealing with PST files below.
You may need to use a third-party import/export solution.
If you receive a message with an attached file called winmail.dat you probably will be unable to open it.
The winmail.dat is invisible to users of Outlook. Such users may not know what you are referring to when you mention it to them.
Other email clients, like Thunderbird, The Bat!, or webmail programs can all send enhanced HTML-based email without any problems for the recipient. This issue is specific to Microsoft's email clients.
Transport-Neutral Encapsulation Format (TNEF) gives a fuller explanation of this issue and the solution.
Gmail now requires OAuth 2.0 sign-in which will affect all email software.
Thunderbird and The Bat! both support OAuth 2.0 authentication for Gmail accounts but you need to turn it on in your Gmail account settings (both the incoming and outgoing server).
Starting with October 3, 2022 Google will block all third-party applications which are using the OAuth out-of-band (OOB) flow, including The Bat! prior to version 10.2. Learn more….
Thunderbird 91.8.0, released 5th April 2022, converts the authentication method of Gmail accounts to OAuth 2.0 to help users comply with Google's requirement of OAuth 2.0 for Gmail logins. These changes are required by Google.
— Mozilla Support
However, changing the account settings is only the beginning.
You then need to give Google permission to allow your email software to access your Gmail account. Check your email program's support and forums for information specific to using Gmail and OAuth 2.0.
See the following for information on making the necessary changes:
Gmail is now configured to use labels rather than physical mailboxes to sort your email. These should be configurable when using IMAP (Gmail is designed for IMAP).
Be sure to configure your Gmail IMAP settings in your email program to match the labels you've used in Gmail. You'll need to log into your Gmail account in a browser during the process of matching labels to your email program's IMAP mailboxes.
“All mail” includes the inbox label by default. Be careful when removing this. Non-existent labels may cause retrieval issues.
Gmail made changes that broke how subscription lists were dealt with. This created problems for people subscribed to lists.
Gmail changed how email subscriptions were sorted. The Primary category was designed so you could quickly find your most important emails easier.
Mail deemed less-important was moved into either the Social (Facebook notifications, etc.) or Promotions (bulk mail such as ads but also subscriptions, updates and more) categories.
Unfortunately, subscription lists and update notices were categorized as Promotions, along with “junk” ads.
Alternatively, you can turn off the new tabs completely by going to the settings, click on the Inbox tab and deselect the tabs you don't want to use (e.g., Promotions) then save the changes.
Gmail has a very effective spam filtering system — sometimes too efficient. To compound this issue, third-party email clients like Thunderbird and The Bat! are not permitted to download mail from Gmail's Spam folder.
To resolve this issue, you'll need to log into your Gmail account using your browser.
Go to the Spam folder then select all your legitimate email messages and click on Not Spam to train Gmail's spam filters to accept mail from these addresses.
You may need to continue to check the Spam folder over time so that Gmail improves its recognition of legitimate emails rather than labelling them as spam in the future.
These resources may help you to resolve Apple MacIntosh:
Traditionally, people had only a single computer and downloaded all message to that one computer, storing important messages forever using POP/SMTP settings.
However things have changed.
Today people want copies of their messages on their computer, laptop, smartphone and tablet.
Most ISPs (e.g., Shaw, Telus, Gmail, etc.) simply give people what they ask for, without explaining the issues or potential problems.
So they tell their customers to set up their email using IMAP usually without any current reference to POP/SMTP settings.
IMAP, POP and SMTP are email protocols and important only when configuring email retrieval.
Once setup, email will be managed transparently if the settings are correct.
IMAP then mirrors the messages on the server AND on all IMAP-connected devices.
That means you have simultaneous access to your email on multiple computers and other devices — including sent messages.
Sounds perfect, doesn't it? But there are potential downsides if you're not careful.
You need to understand how IMAP works and what is different from traditional POP/SMTP email protocols to understand what you're trading for that any time/everywhere access to all your mail.
Email clients using POP/SMTP downloaded email messages from the server and retained them indefinitely on our computers unless we manually delete them. This included copies of sent messages (but only on that one computer).
With IMAP, when you delete a message it deletes in on that device, the server and all other IMAP-connected devices.
So, you need to leave ALL your messages on the server, rather than deleting them from the server when they've successfully downloaded to your computer.
Essentially, IMAP means that you could potentially lose important emails by deleting them on one of your devices, running out of server space or simple user errors.
One possible solution is to use a POP/SMTP primary account with other devices using IMAP when you're away from your computer. If you only use your phone for mail, this issue won't work.
Set up and use a primary account (using POP/SMTP) so that you can retain your important email on your main computer — archiving important messages over the long term.
That primary account should NOT be an IMAP account.
Of course, you'll need to create regular backups of the mail on that computer in case of computer failures or viruses.
Use IMAP only on a secondary email account for messages on all your portable devices (e.g., smartphones, tablets, secondary laptops).
You can still access the mail on your primary account on your remote devices provided this account is configured for POP/SMTP. You'll be able to access NEW message as long as the primary computer has not accessed them.
If you need more, you can change the settings on your primary computer to leave mail on the server for 10 days (or another setting that works for you). That way the primary computer controls what is left on the server and for how long.
On this site:
Return to top
Updated: November 6, 2022