This is a step by step guide to login to your mailboxes in your phone, so that you can get notifications and manage emails within an app.
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Log in to Infraforge/Mailforge > Mailboxes > Click export mailboxes > Export to Salesforge > download CSV file.

After downloading the CSV File, you will have all the credentials for that mailboxes which mainly includes email, password, imap host, smtp host and ports.
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If you are using iPhone, go to Settings on your iPhone > Mail > Mail Accounts > Add Account.
For android, you can check out apps like Spark or Blue Mail

Select "Other" from the list

Input email and password from CSV file downloaded earlier and click Next

Input other details from CSV file like Hostname and port(if asked)
Incoming Mail server = IMAP from CSV
Outgoing Mail server = SMTP from CSV

Click Next and connect, now your mailbox will be connected to your emailing app and you can control it like you would normally do with your Primary email
Get notifications, access emails, send emails, etc.