An email outbound agent
that warms the mailbox and writes the sequence
Cold email fails for two reasons that have nothing to do with the offer: a mailbox that was never warmed up lands in spam, and a sequence written once and sent to everyone reads like a template. We build an agent that warms the mailbox properly, personalizes each message from real account data, and hands a rep the conversation the second someone replies.
The role today
Cold email outbound has two failure modes that show up before a reply rate even matters. The first is deliverability: a new mailbox or a new sending domain that starts blasting volume on day one gets flagged by spam filters within days, and once a domain’s reputation is damaged, it takes months to recover, if it recovers at all. The second is the message itself - a sequence written once and sent unchanged to five hundred prospects reads like what it is, and most recipients delete it without reading past the first line.
Doing both correctly by hand is possible but slow: proper warm-up needs weeks of gradually increasing, realistic sending before a campaign can start, and real personalization needs research on each prospect that a rep rarely has time to do for a list of any size.
What the agent takes over
The agent runs the mailbox warm-up schedule first, two to three weeks of gradually increasing sends that build sender reputation before a single real outbound message goes out, a step that is tedious to do manually and easy to skip under launch pressure, which is exactly why skipping it is the most common cause of a cold-email campaign landing in spam from day one.
Once warm, it builds personalized sequences of three to five touches per prospect, written from that prospect’s actual company and role data rather than a merge-field template, and paces sends within deliverability-safe daily limits per mailbox. A reply or a bounce of any kind stops that prospect’s sequence immediately and routes to a rep’s inbox with the full thread, so a rep never risks sending a scheduled follow-up to someone who already answered.
Every send, open and reply writes to your CRM automatically. For teams running volume across several mailboxes or sending domains, each one gets its own warm-up and pacing schedule, with a shared dashboard showing deliverability health and reply rate per mailbox so a problem on one domain does not get mistaken for a problem with the offer.
What stays with humans
The offer, the ICP, and the sequence copy get written and approved by your team before anything sends. Every real conversation past the first reply is a rep’s job - the agent opens the door and gets out of the way.
Guards
Warm-up and daily send caps are set under provider deliverability limits and do not increase without an explicit change request. Bounce rate and spam-complaint rate are monitored continuously, and sending pauses automatically if either crosses a safe threshold rather than continuing until a domain is already damaged. Every message is logged against the prospect data that generated it, and a kill switch stops all sequences across every mailbox in one message.
Price and timeline
| Option | Price | What it covers | Timeline |
|---|---|---|---|
| Agency runs it | from $2,200 + support plan | One mailbox, warm-up, personalized sequence, CRM write-back | 3 to 5 weeks |
| Full control, handover-ready | from $3,750 | Source, prompts and warm-up schedule handed to your team, multi-mailbox setup | 3 to 5 weeks |
Related
Full package breakdown on the AI agents service page and the automation-everything overview for the rest of your outbound stack. Pair with the LinkedIn SDR agent to run the same ICP on a second channel, and the B2B account research agent to feed both with accounts worth sequencing. For the inbox side once replies land, see Gmail and Outlook inbox agent. Real build: the full outreach and inbox pipeline is in the B2B certification sales agent case study.
Want to see a warmed, working sequence before you commit? Get in touch and we will map the mailbox plan on the first call.
FAQ
How much does an email outbound agent cost?
From $2,200 for one mailbox, warm-up, a personalized sequence and CRM write-back, live in 3 to 5 weeks including warm-up time. Running several mailboxes in parallel for volume usually starts at $4,000.
How long does mailbox warm-up take?
Two to three weeks before real outbound starts, sending gradually increasing, realistic-looking volume to build sender reputation. Skipping this step is the most common reason cold email lands in spam, so we do not skip it even under launch pressure.
Which tools does it connect to?
Your own mail provider (Google Workspace, Microsoft 365 or a dedicated sending domain), and your CRM - HubSpot, amoCRM, Pipedrive or a spreadsheet. Replies route to Telegram or email.
What if the agent emails someone who already said no?
A reply of any kind, including an unsubscribe request, stops that prospect's sequence immediately and is logged, so no one gets a second message after opting out.
Can it personalize beyond a first-name merge?
Yes, each message references the prospect's actual company, role or a signal you define, like a recent hire or funding round, generated per prospect rather than filled into a fixed template.