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Senator Bernie Sanders has raised more than $1 million in small-dollar campaign contributions off two email solicitations that highlighted an attack from allies of Hillary Rodham Clinton, a campaign official said Thursday.

Mr. Sanders and his campaign manager, Jeff Weaver, sent the emails after Correct the Record, a “super PAC” that is coordinating with Mrs. Clinton’s campaign, sent a document criticizing the senator’s record to a reporter at the Huffington Post.

“Yesterday, one of Hillary Clinton’s most prominent super PACs attacked our campaign pretty viciously,” the email from Mr. Sanders said. “They suggested I’d be friendly with Middle East terrorist organizations, and even tried to link me to a dead communist dictator.”

“They’ll keep trying,” Mr. Sanders added, “unless we make them pay a price for their attacks.”

Mr. Weaver sent a similar email.

The amount of money raised is impressive, coming in increments of less than $10 generally, said the campaign official, who was not authorized to speak publicly about the fund raising.