[SalesForce] Delegated approver email notification

Unanimous Checkbox refers to each person or group within the approval process. Although the queue is made of many queue members, the queue counts as one approver, so whoever from the queue approves the record, is approving it on behalf of the entire queue. So as the way the approval process is set up, this is unanimous approval. In order to accomplish what you are trying to do each individual person would have to be named in the approval process. Then unanimous approval would require each individual person to approve before the pparoval goes through.

This is similar to using a queue as a record owner, although there can be multiple members of the queue, the queue still only counts as one entity, not a group made up by its members.

I hope that makes sense and helps.

I have seen this issue myself - if the recipient/approver has an email domain other than the email domain of the sender of the approval request, SFDC won't allow email approvals by that recipient.

For example, you may have email forwarding going on in your mail server so that emails sent to joe@foo.com are forwarded to joe@bar.com; Joe@bar.com won't get the SFDC built-in reply custom address.