When you receive following 'Undelivered Mail Returned to Sender' failure in your inbox when sending an e-mail it can have several causes, including your mail from being marked as SPAM by the receiving mail server. Please sent the entire message to us so we can take a close look at it and inform you what to do.
In general, to prevent your outgoing email sent from out of SpinOffice to be marked as SPAM, we advise you to have our SPF records of our mail servers added to your domain. Your domain hosting provider will be able to to this in the portal area of your domain.
Add the SPF records of our mail servers to the whitelist of your domain in order to have email traffic from our servers to be accepted by your mail provider. The records that should be added are:
When this is done, your sent email will no longer be marked as SPAM.