Email adress with a + (plus) sign in it

[Waldo]

what do they call this? when a company has an email address like:

 

google+support@company.com

apple+support@company.com

 

where they both go to the same email account (support@company.com) but still have a different from address?

 

---------- Post added 27-01-2016 at 16:17 ----------

 

EDIT: Turns out it's called plus addressing / sub addressing:

 

Sub-addressing[edit]

Also known as plus addressing or tagged addressing. Some mail services support a tag appended to the local part, such that the modified address is an alias to the unmodified address. For example, the address joeuser+tag@example.com denotes the same delivery address as joeuser@example.com. The text of the tag may be used to apply filtering, or to create single-use addresses.[8] Some IETF standards-track documents, such as RFC 5233, refer to this convention as sub-addressing. However, the automatic form validation of many web sites rejects + as a valid character in the email address. Some service providers[who?] are inconsistent, and use address tags in their own outbound email, but disallow address tags for users.

 

Disposable email addresses of this form, using various separators between the base name and the tag, are supported by several email services, including Runbox (plus), Gmail (plus and period),[9] Yahoo! Mail Plus (hyphen),[10] Apple's iCloud (plus), Outlook.com (plus),[11] FastMail (plus and Subdomain Addressing),[12] and MMDF (equals).

 

Qmail and Courier Mail Server products support the use of a hyphen '-' as a separator within the local-part, unless disabled during installation. For example, joeuser-tag@example.com or joeuser-tag-sub-anything-else@example.com. This allows qmail through .qmail-default or .qmail-tag-sub-anything-else files to sort, filter, forward, or run an application based on the tagging system established.[13][14]

 

Postfix allows configuring an arbitrary separator from the legal character set. The separator info remains available on the email (address is not rewritten to remove it), and thus is useful in internal mail-routing, filtering, and forwarding via any of the mechanisms existing in Postfix.[15]