When you first set up Mail Collector to check multiple email addresses, your email history, i.e. the old messages in the account inbox, can be retrieved from the third-party account when you set up Mail Collector. Depending on the settings you activated, these messages will automatically be placed in your mail.com inbox or the folder for your other account. Alternatively, you can set up the Mail Collector to only retrieve any new emails that you receive.
Once you have set up Mail Collector in your browser webmail, the other email accounts will automatically sync with your primary mail.com account and incoming messages will also appear in the inbox or designated folder of your mail.com app for Android, iOS or iPadOS. This means you can check multiple email accounts from anywhere in the world and from any mobile device, and all your messages will be accessible in a single place.
No. Mail Collector only retrieves copies of your messages, so you will still find the emails in the inbox of the other email account.