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

[Marc Roos]

 > Yes, you all want me to open ports. I'm sorry guys, but I won't 
budge:
 > 1) Opening a port means reconfiguring the firewall. You may find it 
funny, but some non-profits have no firewall, just a standard ADSL 
router. The ones that the telecom company provides often has no IP 
filtering abilities.

Read your router manual, you can easily only port forward from a single 
or multiple ips to your local

> 2) I will not expose an SMTP server to the outside word. I will not 
install in, or advise to, a small business a piece of software that 
craves for attention 

The problem is your knowledge is limited, and therefore draw incorrect 
conclusions. So maybe try and find someone that has more knowledge in 
your group, or ask around in your charity.

> 3) Of course I can ask the current ISP. And they may comply. But how 
about the next one?

What next one? You should stick with your ISP for years, I have.

> 4) Of course I can filter my provider's IP in some Linux firewall. But 
then the provider will change its setup and won't tell me. Or I will not 
have time to modify the configuration. Or the next person will not have 
time just this week.

These things do not change. I did not change my mail ip's the last 10 
years or so. I guess only 'hillbillies' that hop around from supplier to 
supplier to cut a few dollars a month do this.