I will provide you the server IP and your SMTP Credentials for sending your emails. All you need to do is to just put those credentials / details on to their right place and bingo...
Please note due to Quality Purpose of the SMTP please bear a 15 ~ 30 minutes downtime in every 72 Hours which will be communicated to you on your email well before & I hope that will not impact your production.
Please note that although the delivery is quite strong on free emails however cannot give you 100% guarantee on Gmail and other free email services.
Furthermore please note that SPAM is not at all allowed from the service and this will be a terminable offense without any refund due to its illegality.
SMTP email relay servers for your emails for effecient delivery is ranked 5 out of 5. Based on 1 user reviews.