Transfer Optimum Email to Gmail

Optimum email sits on Optimum's servers, and Optimum stopped creating new email accounts in 2021. Old mailboxes keep working, but your messages stay tied to a service you plan to leave, so many users transfer Optimum email to Gmail before they cancel. Below are two ways to transfer Optimum email to Gmail, with real server settings, Google's new rules and fixes for missing mail.

Can Gmail still fetch Optimum email with POP?

Not for much longer, so plan to transfer Optimum email to Gmail soon. Google says web Gmail will stop fetching mail from other accounts over POP, and Gmailify ends with it. New users lost both features after Q1 2026, and existing users keep them until January 2027. Read Google's page on upcoming changes to Gmailify and POP in Gmail for dates. Older guides tell you to open Gmail settings and add Optimum under Check mail from other accounts. That route to transfer Optimum email to Gmail is closing.

Google's page on third-party email account support in Gmail lists what still works. Gmail's mobile app on Android, iPhone and iPad still adds other accounts over IMAP, and desktop clients such as Thunderbird still connect to Gmail over IMAP. Messages already imported stay in Gmail. Note that Gmail's mobile app only reads and sends your Optimum mail. It leaves old messages on Optimum's servers. To move Optimum email to Gmail for good, you must copy folders into your Gmail mailbox.

What Optimum email settings do you need for Gmail?

To transfer Optimum email to Gmail, you need your Optimum login and three server values. Mail setup guides list Optimum IMAP as mail.optimum.net on SSL port 993 and SMTP as mail.optimum.net on SSL port 465. POP3 uses port 995. Same servers work for @optimum.net and @optonline.net addresses.

Enter your Optimum ID as your username, which is your address before @. If login fails, try your full email address. Switch on outgoing server authentication using your Optimum login. Plain ports 143 and 110 are legacy options, so skip them. Compare these values with BlueMail's Optimum setup page and Univik's Optimum email settings, because both list matching ports.

How to transfer Optimum email to Gmail with Thunderbird?

To move Optimum email to Gmail by hand, add both accounts to Thunderbird over IMAP and copy folders across. That works for one small mailbox. Big folders time out and message properties drop in transit, so check folder counts when copying ends.

1. Sign in to Optimum webmail and confirm your messages are there.
2. Install Thunderbird and add a new mail account with your Optimum address and password.
3. If auto setup fails, choose manual setup. Set IMAP to mail.optimum.net with port 993 and SSL/TLS, and SMTP to mail.optimum.net with port 465 and SSL/TLS.
4. Add your Gmail account in Thunderbird. Google opens a sign-in page in your browser, where you approve access.
5. Wait for Optimum folders to sync, then open Inbox.
6. Select all messages with Ctrl+A, right-click and choose Copy To. Select your Gmail account and a destination folder. Use Copy, not Move, so Optimum keeps your originals.
7. Repeat for Sent, Drafts and every custom folder.
8. Open Gmail in your browser and compare folder counts with Optimum webmail.

Folders you copy during an Optimum to Gmail transfer appear in Gmail as labels. Keep Thunderbird open until sync status shows no pending uploads. To save a local copy of server mail first, read how to download IMAP emails from a server.

Steps to transfer Optimum email to Gmail with software

1. Install Corbett IMAP Migration Tool on your Windows PC with administrator rights.
2. Go to Email Accounts and select Add Account.
3. Enter your Optimum email address and password, then select Find so software detects host and port. If login fails, open advanced settings and enter mail.optimum.net with port 993.
4. Preview your mailbox tree. Untick Spam, Trash or any folder you do not need.
5. Set date, sender or attachment filters if you want fewer emails.
6. Select Export and choose Gmail.
7. Sign in to Google with modern sign-in or an app password, then start. A log and CSV report list what moved and what failed.

Test your Optimum to Gmail move on one mailbox in free demo before you buy. Lifetime licence starts at $99 with a 30-day money-back window. Compare results with folder counts in Gmail. For another provider, see how to move Yandex mail to Gmail. For a UK host, read how to migrate BT Internet emails to G Suite.

Which way to transfer Optimum email to Gmail is best?

Use Thunderbird to transfer Optimum email to Gmail for one small mailbox. Use software to move Optimum email to Gmail when you need folder selection, filters or a progress log. Gmail's phone app reads and sends Optimum mail, but it does not move old messages.

Do you need an app password to move Optimum email to Gmail?

For Optimum email to Gmail, no app password comes from Optimum. Both setup guides above say you sign in with your normal Optimum password, so no app password is needed. Do not use your TV or billing PIN.

For Gmail, it depends on your tool. Thunderbird signs in through your browser. Software accepts Google sign-in or an app password. Google creates app passwords only after you switch on 2-Step Verification, so follow Google's page on sign in with app passwords before you start.

Why are Optimum emails missing in Gmail?

Missing mail comes from four causes after you transfer Optimum email to Gmail. A POP3 setup that deletes mail from Optimum's server leaves other devices without it, so use IMAP. A password change on Optimum leaves old credentials on every device, so update your saved password. Wrong ports or missing SSL stop folders from loading. Unticked folders and active filters leave mail behind in any tool.

Check settings first, then folders, then filters when your Optimum email to Gmail transfer looks incomplete. Technobezz explains both server-side causes in its Optimum email not receiving messages guide. To move mail from another host, see how to export GMX mail to Gmail.

Questions about Optimum email to Gmail