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Sean_Tierney2
Sean_Tierney2
Level 3
December 9, 2015
Solved

Changing sender email domain, but not CNAME/Branding Domain

  • December 9, 2015
  • 3 replies
  • 5395 views

Hi,

Anyone know if there are implications to sender reputation or deliverability if you change your sender email domain but don't immediately update your CNAME and branding domain?

Example

CNAME = myoldcompany.com

Branding Domain = info.myoldcompany.com

Sender/reply-to email domain = @mynewcompany.com

Note, we do not have SPF/DKIM setup...yet.

Thanks,

Sean

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Best answer by Justin_Cooperm2

It's not a big deal, you shouldn't see any significant change in deliverability.

3 replies

Grégoire_Miche2
Grégoire_Miche2
Level 10
December 9, 2015

Hi Sean,

Since you do not have SPF/DKIM set up, the change will not impact you deliverability much, which is already probably not that good anyway

-Greg

Sean_Tierney2
Sean_Tierney2Author
Level 3
December 10, 2015

Ouch...well I wouldn't say it isn't good, but appreciate the feedback

SanfordWhiteman
SanfordWhiteman
Level 10
December 10, 2015

Unless your subscription includes a branded sender domain, SPF isn't hurting your deliverability.

DKIM, however, is a very smart technical investment. There's no reason not to make this happen ASAP.

Josh_Hill13
Josh_Hill13
Level 10
December 9, 2015

I would do your best to do nothing until you have the cname and are ready to make the switch. No one knows about your new domain and some spam filters do check for consistency of link and headers, which you will lack. As Greg said, maybe it won't be huge, but I would put all your ducks in a row first.

    Sean_Tierney2
    Sean_Tierney2Author
    Level 3
    December 10, 2015

    Thanks Josh. Makes sense but the situation is a bit different as the domain change is due to acquisition. So the domain is well establish, just new to us.

    Justin_Cooperm2
    Justin_Cooperm2Accepted solution
    Level 10
    December 9, 2015

    It's not a big deal, you shouldn't see any significant change in deliverability.

      Sean_Tierney2
      Sean_Tierney2Author
      Level 3
      December 10, 2015

      Thanks @Justin Cooperman​, exactly what I was hoping to hear. Follow-up question, any implications to having more than one Marketo instance with the same CNAME and Branding Domain?

      SanfordWhiteman
      SanfordWhiteman
      Level 10
      December 10, 2015

      Follow-up question, any implications to having more than one Marketo instance with the same CNAME and Branding Domain?

      Aside from it being impossible, no implications at all.

      Seriously: the CNAME is an alias for a single hostname.  If someone clicks on landing.example.com, obvs. this request can only go to one of your instances, not both at the same time.

      The only way you could make this work for LPs is by using a reverse proxy w/routing rules based on the LP URL.  And that still wouldn't solve the branding domain.

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