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POP vs. IMAP

If you are using ETRN E-Mail Hosting Service and are setting up your email software (e.g., Outlook, Thunderbird), you must indicate how you want to receive email—either with a POP connection or an IMAP connection. IMAP is quickly becoming the preferred method, since it gives you complete access to all email and all email folders, from multiple computers or mobile devices.

 

POP

When you check your email with a POP connection, new email messages are downloaded to your computer and are then deleted from the email server.

Access: Since your email is stored on your computer, you must be at your computer to access your email.

Storage: You don’t need to worry about running out of online storage space. Since you’re downloading your emails to your computer, you can keep as many emails as your computer can store.

Backup: You should implement an effective backup system for your computer, in case you need to retrieve lost or deleted emails. Please contact us if you are interested in finding out about the backup solutions that we offer.

Internet Connection: You will need an Internet connection to download email, but you can view your downloaded email offline (i.e., without an Internet connection).

IMAP

When you check your email with an IMAP connection, you are accessing and managing your email directly from the email server.

Access: Since the emails are stored on the email server, you can access and manage your email and email folders from multiple computers or mobile devices.

Storage: If you have limited online storage space, you may need to delete some emails periodically to avoid exceeding your storage capacity.

Backup: Email is automatically backed up every evening; so, if you accidentally delete an email, your email administrator can retrieve it—even up to 7 days later.

Internet Connection: If you do not have an Internet connection, you cannot access your email.  Some e-mail clients will cache your IMAP folders locally and provide for off-line access.

Note: By default, email software applications (e.g., Outlook, Thunderbird) store your sent, draft, and trash email on your computer, rather than storing it on the email server (as it should with an IMAP connection). You may need to make some adjustments to your email software setup so that sent, drafts, and trash email will be stored in your online Sent, Drafts, and Trash folders.

We Answer Your Questions: FAQ

Q: What is the maximum e-mail attachment size?

A: The ETRN.com e-mail servers do not limit the size of individual e-mail attachments. The ETRN.com e-mail servers do impose a 400 MB maximum total message size limit. Individual customers can choose a smaller message size limit. We can also customize the handling of "over-sized" e-mails. Please contact us to discuss your specific needs. A couple of important facts:

1. Attachments are typically encoded in what is called Base64[1]. As a result, the actual length of MIME-compliant Base64-encoded binary data is usually about 137% of the original file size.

2. E-mails often contain both plain text and HTML components. This also increases the overall size of the e-mail.