To check on the status of your mailboxes and adjust their quota follow these steps:

  1. Log in to Plesk
  2. Choose the Mail tab on the left. Here you will see all email addresses along with their capacity and current size.
  3. If you spot any mail accounts you are not currently using, it’s best to remove them now. This will help free up space and prevent potential abuse of stale email accounts in the future. If any of the accounts are forwarding to another address, please make sure you disable the mailbox – as you will not need a copy stored on the server! Simply click on the account and uncheck the “Mailbox” option box at the top.
  4. Click on the email account if you wish to adjust the quota
  5. Under “Mailbox” you may specify a size. You cannot increase it beyond the maximum hard limit for your hosting plan.

See the bottom of this page for a video walk-through.

Shared Hosting Mail Hard Limits

Please note that the maximum possible quota / storage limit per mail account on shared hosting is as follows as of Jan 2019:

  • Helium Hosting: 1 Mailbox @ 100MB
  • Carbon Hosting: 25 Mailboxes @ 2GB each
  • Titanium Hosting: Unlimited Mailboxes @ 5GB each

These are hard limits per account in order to ensure our hosting plans are able to function on high-performance solid state drives (SSDs). Using SSDs means excellent website speed, but it also means we have to take our storage limitations very seriously, as SSDs are more limited in capacity than traditional hard drives.

Options: Reduce Storage or Upgrade

There are many options available to help resolve a full mailbox:

  1. Delete messages using your mail app or webmail. Specifically finding and removing messages with large attachments, like videos, photos, and other attachments like PDFs will help the most. When logged in to webmail, click on any given mail folder where you store lots of messages, then in the search box at the top of the message listing, enter size:1M to see all message in the mail folder that are 1MB and larger. Delete all that you can. You may also find it handy to save the attachments in the messages to your computer (just click on the message, then click on any attachments you wish to save) prior to removing them. Once you’re done removing, you must click on the Trash folder, then the “Clear Folder” option at the top of the Trash messages list to empty the trash, removing them permanently.
  2. Archive older messages to your computer, then remove them from the server. This guide will help you learn how.
  3. Aggressive Spam Filtering: if this is a mailbox that you rarely use, set the spam filter to delete spam, with the score threshold set to 1. This way it minimizes the amount of illegitimate email being stored in the mailbox.
  4. Upgrade your hosting plan: if you’re currently on our Helium or Carbon hosting plans, upgrading to the next plan up will allow you a larger maximum per-mailbox limit as listed above. Note: Titanium mailboxes at 5GB max each are the upper limit for hosting your mail on our shared hosting plans. If you cannot reduce your mail storage lower than 5GB, moving to Exchange hosting is your best bet:
  5. Move mail to Microsoft Exchange Hosting to get 50GB per mailbox for $9.99 per mailbox monthly or $99.99 / year.
  6. You may review all mail hosting options for comparison here.

Plesk Quota Settings Video Walkthrough

If you prefer to watch, the video below will walks you through managing the mailbox quota in Plesk 10+ (this may differ from your version of Plesk). Whether you need to increase or decrease your quota, this video will show you how.

The following video will walk you through changing your mailbox quota in Plesk 9. If you’re running into mailbox limits or would like to keep your mailboxes limited lower than the default, check out the video below.

If you have any questions about the above video, or anything dealing with mailbox quotas with Plesk, open a support ticket with us.

Also – feel free to connect with us on Twitter or Google+.

About Jordan Schelew

Jordan has been working with computers, security, and network systems since the 90s and is a managing partner at Websavers Inc. As a founder of the company, he's been in the web tech space for over 15 years.

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