Changing sender email domain, but not CNAME/Branding Domain

[Sean_Tierney2]

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

[Grégoire_Miche2]

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]

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

[SanfordWhiteman]

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]

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]

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 · Accepted solution]

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

[Sean_Tierney2]

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]

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 http://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.

[Sean_Tierney2]

Ah yeah, that makes sense...thanks for the honest call out there.