So I got this message/auto reply (below) in my inbox today after sending approximately 20-25 generic emails. The emails were all just a sales pitch to local businesses. The content of each email was similar in the sense that I just made a basic template and added a couple additional unique selling points to each individual recipient. As a result of getting the (below) auto reply, I have a few questions that I'm hoping you guys may be willing to help me with: - Can I use this email address again for regular non-promotional emails and still have my regular emails arrive I. The recipients inbox safely? Or is my email address permanently flagged and is everything I send from this email address going direct to everyone's spam folders? - These email pitches I was sending before seeing the below message were pretty effective and was getting a good response from them. I'd like to be able to send approximately 75-150 emails daily. To do this would I have to spread the messages across multiple email addresses or could I get them all out from one address? If I have to spead the emails out over a series of accounts, can they be newly created accounts that I've made or do I need to find some aged addresses? - Since I'm only looking to send out 75-150 emails daily I'm hoping this is something that I can do on my own as opposed to hiring a service. I have 10 private proxies that I purchased thru SquidProxies. I'm trying to map out my plan of attack here but am obviously lacking the depth of knowledge that many of you guys have. I would really appreciate if any of you could guide me in the right direction in how I should approach this. Thank you so much. *** Automated Reply I Was Referring To Below *** This message was created automatically by mail delivery software. A message that you sent has not yet been delivered to one or more of its recipients after more than 48 hours on the queue on gt500.websitewelcome.com. The message identifier is: 1X7ORI-0005BJ-CR The subject of the message is: Business Proposal The date of the message is: Wed, 16 Jul 2014 05:35:55 -0700 The address to which the message has not yet been delivered is: email@example.com (ultimately generated from firstname.lastname@example.org) Delay reason: SMTP error from remote mail server after end of data: host alt4.gmail-smtp-in.l.google.com [220.127.116.11]: 421-4.7.0 [18.104.22.1689 15] Our system has detected an unusual rate of 421-4.7.0 unsolicited mail originating from your IP address. To protect our 421-4.7.0 users from spam, mail sent from your IP address has been temporarily 421-4.7.0 rate limited. Please visit 421-4.7.0 http://www.google.com/mail/help/bulk_mail.html to review our Bulk 421 4.7.0 Email Senders Guidelines. p7si4341260wiz.103 - gsmtp No action is required on your part. Delivery attempts will continue for some time, and this warning may be repeated at intervals if the message remains undelivered. Eventually the mail delivery software will give up, and when that happens, the message will be returned to you.