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Jason_Scott
Jason_Scott
Level 4
August 18, 2015
Question

Major bounce errors with sbcGlobal

  • August 18, 2015
  • 3 replies
  • 11345 views

We have a lot of small business using domains sbcglobal.net, which is now part of AT&T.  We are having issues with emails getting through.  It doesn't matter the email content or from address.  They always hard bounce with the error code "553 5.3.0 flph399 DNSBL:RBL 521< XXX.XXX.XXX.XXX >_is_blocked.__For_information_see_att.net/blocks".  Obviously they are getting blocked.  We've limited sending to sbcglobal email address to only-as-needed basis.  Had them send an email to us then reply using the outlook plugin so the reply came from our marketo server, which has a dedicated IP.  We can send emails without issue through our outlook server.

Have you had issues with sbcglobal?  What did you do to fix it?

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3 replies

Mike_Reynolds2
Mike_Reynolds2
Level 10
October 26, 2015

Emails being bounced can sometimes still get successful deliveries if the bounce was the result of a spam filter watching a spam trap or blacklisting service. If that gets de-listed with the spam trap or blacklist service, you could get successful deliveries again. Don't count on it. But it's possible. You could also try maintaining a directory of leads that are bouncing your emails. This would show you which leads you need to prune from your database

Maintaining a Directory of Leads Bouncing Emails

Dan_Stevens_
Dan_Stevens_
Level 10
October 26, 2015

Good luck sending emails to anything AT&T owned.  For us, we have never been successful in sending Marketo emails to AT&T recipients.  In fact, we have a few clients that block ALL emails from Marketo - regardless who the sender is.

Mike_Reynolds2
Mike_Reynolds2
Level 10
October 27, 2015

@Dan Stevens​ Our Deliverability team immediately responds to any Blacklisting or SpamTrap hit that occurs to request de-listing. AT&T does have more strict filters than some others, but there is no reason to say that AT&T blocks ALL emails from Marketo as a rule. I'm looking at another customer's instance right now, ran a quick smart list, and it shows thousands of leads who have had successful deliveries with AT&T email addresses.

Email senders develop a reputation with email service providers based on sending behavior. Things like sending emails to leads that have invalid email addresses or have continually bounced your emails, sending to leads who have never taken action to open or click your email, these can play into your sending reputation and negatively effect your deliverability rates. Different email providers have different settings, but with good lead database cleaning and maintenance, you can improve your reputation to ensure good deliverability rates, even with AT&T. If you've had bad rates with them, it's likely due to sending reputation and is definitely something to look into closely within your account.

Marketo has a large number of resources devoted to this. Here are some of them that are the most useful:

Email Deliverability Resources: marketo.com/email-deliverability/

Troubleshooting Email Deliverability: https://nation.marketo.com/docs/DOC-1948

Quarantined IP Range: https://nation.marketo.com/docs/DOC-1381

Blacklist Remediation: https://nation.marketo.com/docs/DOC-1148

What is a spamtrap: https://nation.marketo.com/docs/DOC-1144

What is a Blacklist: https://nation.marketo.com/docs/DOC-1145

Blacklist Deep Dive: https://nation.marketo.com/docs/DOC-1116

Successful Reconfirmation: https://nation.marketo.com/docs/DOC-1149

Dan_Stevens_
Dan_Stevens_
Level 10
October 27, 2015

Mike, I never said that AT&T blocks all Marketo emails.  I said that we have some accounts - Centrica in the UK is one - that has active blocks of all emails sent from Marketo.

    A
    Anonymous
    October 27, 2015

    We had problems with some of the smaller ATT domains a couple of months back, specifically sbcglobal, prodigy, pacbell and a few others. For whatever reason we were getting deliverability to ATT.net, but not the subdomains.

    The Marketo deliverability team admitted they were having deliverability issues into those domains and asked to suppress those until the issues could be resolved. When I got word the issue had been fixed, I slowly added openers only, then scaled up the volume to the rest.

    That seemed to fix any the issues we had and I have not experienced deliverability problems since. Here are the ATT sub-domains that were suppressed.

    @sbcglobal

    @prodigy.net

    @pacbell

    @ameritec

    @swbell

    @flash.net

    @nvbell.net

    @snet.net

    Hope this helps,

    Jason

    Jason_Scott
    Jason_ScottAuthor
    Level 4
    November 2, 2015

    Thanks!  We suppressed a lot of email addresses and slowly brought them back up.

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