Last updated on: 2018-11-20
Authored by: Rackspace Support
Get quick answers to common questions about Rackspace Email.
The maximum size of a Rackspace Email box is 25 GB.
The maximum size for an attachment in the Rackspace environment is 50 MB.
You can create an unlimited number of group lists. Each group list can have an unlimited number of internal recipients and a maximum of 250 external recipients.
The main difference between IMAP and POP is that IMAP works with email directly on the server, while POP fetches mail from the server and works with it on your local computer. For more information, see IMAP and POP mail protocol comparison.
We strongly recommend using an IMAP connection with Rackspace Email.
You can view your billing invoice through the Cloud Office Control Panel. After you are logged in, click your account name in the upper-right corner and select Billing & Payments. The click the Invoice History link. You can then select any of your past invoices to view their history.
No worries! Just call our main support line so we can direct you to your dedicated support team for help: 1 800 961 4454.
To purchase or make an upgrade to your account, log in to your control panel, click your account name in the upper-right corner, and select Upgrades & Services. Click the link for the product you want to upgrade.
Log in to your control panel and click the Support menu at the top of the screen. From the menu, select View Tickets. To create a new ticket, click New Ticket and fill out the information describing your request or issue and submit. You can also view a history of your most recent tickets.
To view the Cloud Office system status, go to https://status.apps.rackspace.com/.
Transport Layer Security (TLS) and its predecessor, Secure Socket Layer (SSL), are cryptographic protocols that provide security for communications over networks. TLS and SSL encrypt the segments of network connections at the application layer to ensure secure end-to-end transit at the transport layer. For our purposes, they create an encrypted tunnel through which we send plain text emails.
Cloud Office servers by default attempt a TLS connection for both in and outbound email. For outgoing mail (any of our servers sending to external MX servers), we perform TLS if it is advertised by the remote server. When performing outgoing TLS, our servers are permissive with the certificate (in other words, if the site is using an untrusted or self-signed certificate, as long as it is a working certificate, we should still accept it).
Our outgoing SMTP servers use TLS in an opportunistic fashion. This means that our servers attempt to open an SMTP transaction with the recipient server by using TLS. If TLS cannot be successfully connected, the communication defaults back to an unencrypted transmission of the data, also referred to as PLAINTEXT.
Our servers respond to TLS and SSL requests to send mail to us encrypted.
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