They then send their spam mail to all those addresses.
Spammers often try to guess recipient addresses by generating multiple random email addresses at a domain. Version 10.1 also detects directory harvesting, a method used by spammers to email as many recipients as possible within one domain. In its ongoing bid to help users win the battle against spam, GFI is offering the SPF module as freeware. The framework permits users to check automatically whether a particular email sender is forged. SPF is rapidly gaining acceptance by leading organizations as a key method of blocking spam through sender authentication.
GFI MailEssentials for Exchange/SMTP 10.1 is one of the first server-based anti-spam solutions to support the anti-forgery Sender Policy Framework (SPF). GFI offers SPF (Sender Policy Framework) as freeware module to help users protect against emails from forged senders
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