G-Lock Apps is the superior Inbox delivery and spam filter testing service that helps users determine and fix possible deliverability problems before sending the message to the subscribers.

With G-Lock Apps, users get the report of how their email is placed across major ISPs, at what Gmail tab the email is delivered and what ISP blocked the message. In addition, G-Lock Apps verifies the sender authentication such as DKIM and SPF, checks the email against spam filters and tracks email delivery duration. GlockApps supports content-based filters such as Postini, Barracuda, and SpamAssassin that will report anything that might cause the email to be sent straight to the spam folder.

Plus, users can use G-Lock Apps IP Reputation Monitor to check their sending IP address against dozens of blacklists (Spamhaus, SURBL, SORBS, and more) at a regular basis. 

The main difference of GlockApps from simple content checkers for spam keywords is that it requires the user to send the message to multiple "seed" email addresses in order to check the spam score of the email content, sender reputation (reputation of the sending email/domain), authentication and real email placement across dozens of ISPs.

Each ISP or webmail service will store information about the outgoing mail servers used to send large volumes of email to it. Over time, each of these mail servers gains a reputation, good or otherwise. If a particular set of servers send a lot of mail that is later marked as spam, the user will find their emails struggle to get delivered to some ISPs or webmail services. GlockApps checks the reputation of the outgoing mail servers and lets the user know if any ISPs or popular filters are flagging their email as spam.

GlockApps scans the email headers and any links used in both plain text and HTML versions, checking if any email blacklists have information about them. This is very important because if one of the links used in the email is on a blacklist, the sender reputation will be negatively affected.

G-Lock Apps can be used by small and large companies and individual email marketers who are looking to maximize their Inbox delivery and improve their email campaign performance.