diff --git a/src/mail-app/mail/view/MailViewerHeader.ts b/src/mail-app/mail/view/MailViewerHeader.ts
index c41f8aec9cf5..f2e1a68396ab 100644
--- a/src/mail-app/mail/view/MailViewerHeader.ts
+++ b/src/mail-app/mail/view/MailViewerHeader.ts
@@ -192,6 +192,8 @@ export class MailViewerHeader implements Component<MailViewerHeaderAttrs> {
 	private renderSubjectActionsLine(attrs: MailViewerHeaderAttrs) {
 		const { viewModel } = attrs
 		const classes = this.makeSubjectActionsLineClasses()
+		const senderName = viewModel.getDisplayedSender()?.name?.trim() ?? ""
+		const displayAddressForSender = senderName === ""
 
 		return m(classes, [
 			m(
@@ -230,7 +232,10 @@ export class MailViewerHeader implements Component<MailViewerHeaderAttrs> {
 						  )
 						: null,
 					this.tutaoBadge(viewModel),
-					m("span.text-break" + (viewModel.isUnread() ? ".font-weight-600" : ""), viewModel.getDisplayedSender()?.name ?? ""),
+					m(
+						"span.text-break" + (viewModel.isUnread() ? ".font-weight-600" : "") + (displayAddressForSender ? ".invisible" : ""),
+						displayAddressForSender ? viewModel.getDisplayedSender()?.address : senderName,
+					),
 				],
 			),
 			m(