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ColdStack
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Sender Mailboxes
Scale beyond 40–50 sends/day with intelligent mailbox rotation + warmup
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DNS / Auth issues detected
One or more sending mailboxes have missing or misconfigured SPF, DKIM, or DMARC records. Fix these before sending to avoid deliverability problems.
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SMTP credentials for this inbox. ColdStack will rotate sends across your mailbox pool.
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From Name
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SMTP Host *
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SMTP Username *
SMTP Password *
Daily Cap
Max sends per day once warmed up
Warmup Target
Cap starts at 5, ramps +5/day
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Assign to Campaign
Select which campaigns can send from this mailbox. Use weights to control send distribution.
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