Email marketing agencies sell the one channel where a business owns the audience outright, which is exactly why it is worth doing well and exactly why doing it badly is expensive. The risk is not a ranking penalty; it is federal law, deliverability damage that takes months to repair, and a list that stops opening. There is also a specific trap in this purchase that catches buyers who assume outsourcing moves the obligation along with the work. It does not. This page covers what these agencies actually do, how they price it, which duties stay with you whatever the contract says, and how to vet a candidate before handing over your list.
What the work actually includes
Four distinct jobs get bundled into the phrase email marketing. Strategy and lifecycle design decides which messages exist at all: welcome sequences, nurture flows, post purchase series, win back campaigns and the regular newsletter. Production is the writing and design of those messages, plus the templates they sit in. Technical work covers platform configuration, list hygiene, segmentation, authentication records and the deliverability monitoring that keeps messages arriving in inboxes rather than spam folders. Reporting closes the loop, ideally to revenue rather than to open rates, which have become unreliable since mail clients began pre fetching images. An agency strong in production and weak in deliverability will make beautiful emails that fewer and fewer people receive, so ask which of the four a candidate does in house and who exactly handles the technical layer.
The obligations that stay with you
The FTC's compliance guidance for the CAN-SPAM Act sets requirements that apply to commercial email regardless of who presses send. Header information, meaning the from, to, reply to and routing details, must be accurate and identify the person or business who initiated the message. The subject line must accurately reflect the content. The message must disclose clearly and conspicuously that it is an advertisement, and must include a valid physical postal address, which can be a street address, a post office box or a private mailbox. It must give a clear and conspicuous explanation of how to opt out, through a return email address or another easy internet based method, and that mechanism must remain functional for at least thirty days after sending. Opt out requests must be honoured within ten business days. The FTC states directly that even if you hire another company to handle your email marketing, you cannot contract away your legal responsibility to comply, and that both the company whose product is promoted and the company that actually sends the message may be held legally responsible. Each separate email in violation is subject to penalties of up to $53,088.
Reviews, testimonials and claims inside campaigns
Email campaigns lean heavily on customer proof, and the FTC's endorsement guidance governs it. Material connections between a reviewer or endorser and the business must be disclosed where a significant minority of consumers would not expect them and the connection would affect their evaluation, and the disclosure must be clear and conspicuous. Incentives cannot be conditioned on a review being positive, because that motivates a favourable review for reasons unrelated to honest opinion. Fabricated engagement, such as likes from people who do not exist, is prohibited, and enforcement can reach both buyers and sellers. And as with sending, responsibility does not travel with the work: the guidance states that a company is ultimately responsible for what others do on its behalf and expects advertisers to train, monitor and give clear guidance to the people acting for them. If an agency proposes a testimonial or review sourcing programme, ask to see how disclosures will be handled before the first send.
How agencies price email work
Three shapes dominate. A monthly retainer tied to a number of campaigns and flows is the most common and the easiest to compare when the deliverables are stated in countable units. Project pricing suits discrete work such as a platform migration, a template system rebuild or the build of a lifecycle programme that then runs in house. Performance components appear in ecommerce work, usually as a share of attributed revenue, which makes the attribution model a commercial term rather than a technical detail; agree how revenue is attributed before agreeing the percentage. Whatever the shape, ask what is included: how many campaigns, how many flows, how many design variants, how many tests, who writes the copy and what the reporting cadence is. Ask separately who pays the sending platform fees, which are often quoted outside the retainer and grow with list size.
Vetting an email agency before handing over the list
Ask which platforms the agency works in every week rather than which it lists on a capabilities slide, because platform fluency is most of the technical layer. Ask how it handles authentication and deliverability monitoring, and what it would do if your domain reputation dropped. Ask how it acquires consent for new subscribers and whether it will ever send to purchased or rented lists, which is where CAN-SPAM problems and deliverability collapse usually begin. Ask for examples of flows it has built and the reporting it produces, and ask what it measures now that open rates are unreliable. Then settle ownership: your business should own the sending platform account, the list, the templates and the reporting, with the agency given access. That single term turns the end of an engagement into a handover rather than a rebuild.
Questions people ask about email marketing agencies
If an agency sends our emails, are we still liable?
Yes. The FTC states that even if you hire another company to handle your email marketing you cannot contract away your legal responsibility to comply with the law, and that both the promoted company and the sender may be held legally responsible.
What must every commercial email include?
Accurate header information, a subject line that reflects the content, clear disclosure that the message is an advertisement, a valid physical postal address, and a clear and conspicuous opt out method that stays functional for at least thirty days.
How quickly must we honour an unsubscribe?
The FTC's compliance guidance says opt out requests must be honoured within ten business days, and the opt out mechanism must be able to process requests for at least thirty days after the message was sent.
What do email marketing agencies charge?
Usually a monthly retainer tied to a stated number of campaigns and flows, sometimes project pricing for migrations or programme builds, and in ecommerce occasionally a share of attributed revenue. Ask who pays the sending platform fees separately.
Should we let an agency source testimonials for campaigns?
Only with disclosures agreed first. The FTC requires clear and conspicuous disclosure of material connections, forbids conditioning incentives on positive reviews, and holds the company ultimately responsible for what others do on its behalf.