I have an email account, provided by a mobile/internet provider, which can only be used when connected to the said operator, either via mobile or from a fixed connection. Use = receive incoming emails or send them. The SMTP server only accepts requests when I am connected to the provider 4G or fixed internet connection.<p>I would like to keep using the account, but basically just forward all emails to a gmail account (easy) <i>and</i> send emails from the gmail account, but forwarded through my old email.<p>I can use a raspberry pi connected to the home network which is run by the said provider.<p>Any ideas?