Sinch sends Hard Bounces for valid email addresses

[SCHNEIDERT]

Dear Experts,

did anyone ever check/verify the Hard Bounces, sent by Sinch to SAP Marketing Cloud, with another tool, e.g. Neverbounce?

E.g. in our last mailing I noticed that 20% of the Hard Bounces are for email addresses which are declared as "valid" by Neverbounce.

Has anyone had similar experiences?

In addition to that we're still receiving a part of the Hard Bounces in our mailbox instead of SAP Marketing Cloud and no one is able to explain that behavior... has anyone maybe even faced that issue too?

BR Tobias

[MarkusGrant]

Hi Tobias,

Are you using a dedicated IP address or shared IP address? This can have a big impact of course especially if using a shared IP address , where you have no control over what other Sinch customers are sending out.

We've noticed on occasion that the sender reputation of the IPs has dropped and that may cause the IPs to be blacklisted by certain spam filters or ISPs.

Cheers,

Markus

[SCHNEIDERT]

Hi markusgrant,

thanks for that input. When implementing SAP Marketing Cloud, SAP told us that a dedicated IP won't make sense for us because of the small amount of emails we're sending. But yeah, I understand the problem of a shared IP... 😕

The bigger problem for us is the communication with Sinch using Support Launchpad. I had a ticket open for many months (!) without any result or solution, always the same questions and answers,... that's really annoying.

[isathore]

Hello All,

I would like to share the blog post SAP Marketing Cloud Bounces Management using Sinch E-mail 365 | SAP Blogs. I hope it can help understanding how bounces are managed and some facts behind them.

Best Regards

Isabelle