Looking for a guide to collect all e-mail from the ISP mail server

[Gregory Heytings]

>> I too would strongly advise you to use Google Workspace (the recent new 
>> name for G Suite, previously known as Google Apps). It's cheap, very 
>> reliable, and has all features you can dream of, including an 
>> autoresponder. It's unrealistic to think that it's possible to beat a 
>> service that costs a mere USD 6 / user / month (and is free for 
>> nonprofits!).
>
> I would not advice any company that is continuously being fined for 
> breaking the law.
>

This is not only an overstatement, it is completely irrelevant.  Given the 
OP problem statement (small business, part-time admin, newbie to mail 
servers), I do not think there is a better solution.  A small server 
already costs 20 USD / month, running a mail server consumes a significant 
amount of resources, and as the OP mentions running a mail server also 
represents a high security risk.