The best part is that it has some features which are not available in other email providers like Inbox by Gmail, Yahoo Mail etc., I wish they would have more options as compared to their competitors but overall its good so far! Nothing much since we were using this before switching over from our old provider and now everything seems working fine without any issues at all. We're satisfied users because there's no downtime yet when you use retaurus along side your existing mail server or if used separately then also nothing major comes up while sending emails through outoutbound SMTP servers (like hotmail).
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