This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: f.urrutia@cad-cae.com host maynenet.com [191.96.165.30] SMTP error from remote mail server after RCPT TO:: 550 f.zaversnik@worldnet.att.net host ff-ip4-mx-vip2.prodigy.net [144.160.159.22] SMTP error from remote mail server after RCPT TO:: 553 5.3.0 ... 550 worldnet addressee unknown, relay=[13.251.162.251] f.zayasbazan@umiami.edu host umiami-edu.mail.protection.outlook.com [104.47.58.110] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DM6NAM10FT016.eop-nam10.prod.protection.outlook.com] f.zanni@sincretech.it host esva2.sincretech.it [176.221.55.134] SMTP error from remote mail server after RCPT TO:: 554 5.7.1 : Recipient address rejected: Access denied f.vally@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found f.emma@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found f-o-x@mweb.co.za host securemail-mx3.synaq.com [196.35.198.130] SMTP error from remote mail server after RCPT TO:: 550 rejected because recipient verify failed -- user not found f.zahn@logo-box.domino.de host logo-box.domino.de [85.13.151.166] SMTP error from remote mail server after RCPT TO:: 554 5.7.1 : Relay access denied F.VANDENBEMDEN@dirafrost.be host dirafrost-be.mail.protection.outlook.com [104.47.5.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [HE1EUR02FT050.eop-EUR02.prod.protection.outlook.com] F.GASMI@dirafrost.ma host dirafrost-ma.mail.protection.outlook.com [104.47.6.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR02FT028.eop-EUR02.prod.protection.outlook.com] f.boccnfam@smit.com host smit-com.mail.protection.outlook.com [104.47.10.36] SMTP error from remote mail server after RCPT TO:: 550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [DB5EUR03FT003.eop-EUR03.prod.protection.outlook.com] f.schwarz@cryptual.com all hosts for 'cryptual.com' have been failing for a long time (and retry time not reached)