What is a Quarantined address? = Email is invalid
Ofsys automatically puts addresses in uarantine when Ofsys receives 100% information, from destination servers, that this address is not valid.
Quarantaine means, « this mail address does not exist: "Ofsys spoke to the server and we are convinced that this address email@example.com doesn't work and will never work.».
A contact that is in Quarantine is not de-activated in Ofsys, it will no longer receive messages and if its Email address is corrected, he will resume to receive messages.
If our clients are interested in knowing more about which contacts have been placed in Quarantine, then in addition to the interface "invalid emails" section, they should look in our daily exported CSVs, in the CSV dedicated for Contacts and look for field : « isInvalidMailbox » is equal to « 1 » if we are certain that the address is wrong. Our clients could ask a new email address to their clients when they come back to the website or call the company or receive a call from the company.
Bounces (Soft and hard) = Server refuses the Email
It means that the message was not delivered but it's for another reason than the validity of the email address. In other words, all other reasons that a message cannot be delivered EXCEPT « the account isn't good ». Examples : Full mailbox: generally a hard bounce, but of course temporary (tomorrow, it might work). Content rejected by spam filter, it will also be a hard bounce, but next message could very well be accepted. Serveurs full, the destination server could be in temporary troubles. Hard bounces and Soft bounces do not have any connections with the concept of "the address isn't good". So, a bounce that doesn't put the contact in quarantine means that "the message could not be delivered for X reason but the address is probably right". The problem is something else.
Hard bounces « Hard bounce » are all « 5xx » answers from SMTP servers. It's a mechanic that says "Don't try to send me this message, I don't want it". But it has nothing to do with the validity of the Email address. How does Ofsys manages errors? We work with our mechanism of Quarantines. Ofsys is completely automated and transparent for our clients. We analyse EXACT responses from servers of major Webmail clients and well known SMTP types and we put as quarantine, all emails that are recognized as invalid (account terminated, unknow user, etc...). Our system eliminates 99% of bad addresses and the rate of false positives is extremely low : less than 1 on 1 million. Our clients ignore the management of bounces and this is what we recommend, Ofsys will manage.