ExclaimerServer-side signature insertion across Microsoft 365, Exchange and Google Workspace95.0NEWCustom
CodeTwo Email SignaturesPurpose-built for Microsoft 365 and Exchange, with signatures added in transit92.0NEWCustom
OpensenseTurns the signature into a measurable marketing channel with banners and click analytics89.0NEWCustom
Crossware Mail SignatureRules engine controls which signature each sender and recipient receives86.0NEWPer user, per month
NewoldstampDrag-and-drop builder with dynamic content and multi-client support77.0NEW$2.00 per month
Exclaimer applies signatures server side, so every message gets the right signature regardless of the device it was sent from. Central control of disclaimers, campaign banners and per-department rules make it the default for large Microsoft estates.
CodeTwo specialises in Microsoft environments, adding signatures in transit so they appear on mail sent from phones and Outlook alike. Strong rule-based targeting and a straightforward per-user licence.
Opensense covers the management side across Microsoft 365, Google Workspace and Salesforce, then goes further by making the signature a campaign surface with targeted banners and reporting on clicks.
Crossware handles complex estates: per-sender and per-recipient rules, multi-platform coverage including HCL Domino, and server-side application so nothing depends on the user's client.
Xink keeps signatures accurate by pulling names, titles and numbers from the directory, then deploys across Microsoft 365, Outlook and Google Workspace with department-level banner targeting.
Letsignit is aimed at marketing teams that need the signature locked to brand: centralised templates, governance over what individuals can change, and scheduled banner campaigns with tracking.
Newoldstamp is the accessible end of centralised management: a visual builder, dynamic fields and campaign banners, without the server-side setup the enterprise tools require.
Bybrand focuses on getting HTML signatures onto a team quickly, with a clear editor and direct deployment integrations. Priced per signature, which suits teams that only need a handful.
Signitic syncs from Microsoft 365 or Google directories so signatures update themselves as people change roles, and schedules banner campaigns per team.
WiseStamp sits at the small end: quick to set up, good template range and social integrations, with team management available but lighter than the platforms above.
Implementation timelines vary: lightweight solutions like Newoldstamp, Bybrand or WiseStamp can deploy within days to a week for smaller teams, whilst server-side platforms like Exclaimer, CodeTwo or Crossware typically require 2-4 weeks including testing, training, and rollout across the organisation.
Most modern platforms support Microsoft Outlook (desktop and web), Google Workspace Gmail, Apple Mail, and mobile clients. Exclaimer and Crossware offer the broadest compatibility, including HCL Domino in Crossware's case; CodeTwo excels specifically with Microsoft 365; Bybrand and WiseStamp deploy client side, so mobile signatures need setting up per device.
These platforms enforce consistent legal disclaimers, jurisdiction-specific notices, and regulatory text automatically across all employee emails. They maintain audit trails of signature usage, provide version control, and ensure that all outgoing messages include required corporate information such as company registration details.
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