> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.worldline.ca/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Why am I seeing a security certificate warning in my email app?

If your mail program pops up a warning like "the identity of this server cannot be verified" or "security certificate has expired," here's what it means and what to do.

## What it means

Mail servers prove their identity with a security certificate. The warning appears when your mail app can't validate the server's certificate. It is usually caused by one of two things:

1. **A settings mismatch on your device** — for example, the server name in your account settings doesn't exactly match the certificate (check it's exactly **mail.worldline.ca**), or the port and SSL option are mismatched.
2. **A certificate problem on the server side** — for example an expired certificate. This one is ours to fix, not yours.

## What to do

1. Check your account settings: incoming **mail.worldline.ca** port 993 (IMAP, SSL), outgoing **mail.worldline.ca** port 465 (SSL) or 587 (STARTTLS). Fix any mismatch and try again.
2. If the settings are right and the warning persists, **don't repeatedly tap "trust anyway"** — report it to support so we can fix the certificate.
3. In the meantime, use webmail at https://webmail.worldline.ca — your mail keeps working there while we sort out the certificate.

## Not sure an email about your account is really from us?

Certificate warnings sometimes make people worry about scam emails too, so a quick note: if you receive an email claiming to be from Worldline that asks you to click a link and enter your password or make an urgent security change, and you're not sure it's genuine, don't click. Forward it to **support@worldline.ca** and we'll confirm whether it's really ours.

## Contact us

support@worldline.ca or 1-855-299-0025 (Mon–Sat 9am–6pm Eastern, closed Sunday).