Modeemi membership includes an e-mail address in format username@modeemi.fi, and 1GB space for your messages (hopefully soon we increase that limit). Name.Surname@modeemi.fi alias is available upon request, and it is possible to use it as well during email submission. You can receive and send email with mail client of your choice - Thunderbird, or simply Gmail app for android.

To create config which will be active, create file .dovecot.sieve in Your home directory, and create config which looks like that (but adjust it so that it matches your needs). If You define that some mails are redirected to specific folder - first create it (You can do so in your mail client) - they are not automatically created.

# My Sieve Filter
# List the extensions used by this script
require ["fileinto", "reject"];

# Messages bigger than 2MB will be rejected with an error message
if size :over 40000K {
  reject "I am unable to accept email larger than 40MB.";
} elsif anyof (
    address :matches "from" "*report*@*",
    header :contains "subject" "Report",
    address :matches "from" "*dmarc*@*",
    header :contains "subject" "*dmarc*"
) {
    fileinto "dmarc";
} elsif address :is ["To"] "doors@modeemi.fi" {
  fileinto "doors";
} elsif address :matches "To" "hallitus@*" {
    fileinto "Board";
} elsif address :matches "To" "board@*" {
    fileinto "Board";
} elsif address :matches "To" "*@tuni.fi" {
    fileinto "tuni";
} elsif address :matches "To" "*@trey.fi" {
    fileinto "trey";
} elsif not anyof(
    address :is "To" "username@modeemi.fi",
    address :is "To" "username@modeemi.cs.tut.fi"
) {
    fileinto "Others";
}