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IMAP or POP?

As a ACC member you may use either IMAP or POP (rather not, limited) to connect to you mailbox from home via for example the program "Mozilla Thunderbird". IMAP and POP are diffrent protocols that the mail client uses to connect to our servers.

The common factor is that you have to use the secure socket layer, or SSL to use these protocols, so that the traffic between you client and our servers will be encrypted. All access with plain, non-encrypted protocols are disabled, so be sure that you have checked the SSL-box, or you will not get the mail.

In general, the POP protocol downloads your mail from the server, erases the copys that are on the server and only stores them on your computer. This means that if you also want to download your mail via our webmail, Puss, the mail that you've already downloaded will not be available. In other words, POP is only a good alternative if you only want to store your mail on your computer and don't have anything other than the inbox.

IMAP reads the mail from remote, connecting to the server and you can choose which mail to read and/or delete from the server. After the download, they are still available at the server, so that you can view them with Puss or from other computers. Some clients also have the ability to synchronize with the mailserver, downloading all messages for you to read even with no connection.

One potential problem with IMAP is that your inbox has a limited size. This means that you have to move messages that you want to keep to a folder under your home directory. This can be done via the client. You don't have to worry about losing any mails because of a filled inbox. Our system will automatically move it if you don't, then inform you how you can access the old mails.

When you have selected the protocol that fits your needs, continue to the guide where you can get help configuring Mozilla Thunderbird for IMAP or POP. If you don't have Thunderbird installed, you can find a link to the download page on our page with links.

IMAP


Choose "Tools" and "Account Settings...".


Click the button "Add Account...".


Choose that you want to create an E-mail account, and click "Next >".


Fill in your name and e-mail address at ACC, and click "Next >".


Select "IMAP", and enter imap.acc.umu.se as incoming and mail.acc.umu.se as outgoing server. Click "Next >".


Make sure that your account name is correct. Thunderbird gets it right most of the times. Click "Next >".


Thunderbird makes a suggestion of the internal account name. This is often the best, so just click "Next >".


Make sure that all facts are correct, and click "Finish".


The account is now created. We just have to do some adjustments.


Start by selecting "Server Settings" to the left. Select the "SSL" option and make sure the "Use secure authentication" checkbox is unchecked.


Now, click the "Outgoing server (SMTP)". Click on the "mail.acc.umu.se"-alternative and click "Edit...".


Change the value of "Port" to 587, and make sure that "Use name and password" are unchecked. Also click the "TLS, if available" option.

See certificate information at the bottom of this page for information about the encryption certificates.

You are now done. Close all dialogs with the "Ok"-button and click the "Get mail" icon up to the left in the main application.

POP


Choose "Tools" and "Account Settings...".


Click the button "Add Account...".


Choose that you want to create an E-mail account, and click "Next >".


Fill in your name and e-mail address at ACC, and click "Next >".


Select POP, and enter pop.acc.umu.se as incoming and mail.acc.umu.se as outgoing server. Click "Next >".


Make sure that your account name is correct. Thunderbird gets it right most of the times. Click "Next >".


Thunderbird makes a suggestion of the internal account name. This is often the best, so just click "Next >".


Make sure that all facts are correct, and click "Finish".


The account is now created. We just have to do some adjustments.


Start by selecting "Server Settings" to the left. Select the "SSL" option and make sure the "Use secure authentication" checkbox is unchecked.


Now, click the "Outgoing server (SMTP)". Click on the "mail.acc.umu.se"-alternative and click "Edit...".


Change the value of "Port" to 587, and make sure that "Use name and password" are unchecked. Also click the "TLS, if available" option.

See certificate information at the bottom of this page for information about the encryption certificates.

You are now done. Close all dialogs with the "Ok"-button and click the "Get mail" icon up to the left in the main application.

Certificate information

The certificates that are used for the encryption are created by a Certificate Authority and unless that CA is told to be trusted, Thunderbird will ask every time whether it is ok or not (there is an Always accept choice too).

This is how you can verify that you are getting the correct certificate.

At ACC we use certificates from the HPC2N at Umeć University system. Start off by downloading their Certificate Authority, download the cacert.crt for Thunderbird and/or cacert.der for Microsoft mail clients. Save the file somewhere on your local computer.


Choose Edit -> Preferences and then click on Privacy -> Security -> View Certificates.


Click on Authorities -> Import and then select the cacert.der you just downloaded.


Mark at least "Web" and "Email" and then Ok. It will then know that our certificate is ok.



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This page was last changed by wmaster on 05/08 - 2009.